That's it from us on this game, so thanks for joining us!
But while we wait for the men's fixture, which starts at 19:00 BST, you can follow England's attempt to fight out a draw here.
Post update
There were some errors in the field that they'll want to put right in the final, and they'll be grateful this drop for six didn't cost them too much!
Post update
So if these two teams do meet again in the final, it's Southern Brave who will have the upper hand after this thrashing.
We were wondering how they'd get on without Smriti Mandhana, but they proved today why they've gone straight into the final and won seven of their eight games.
Post update
Michael Carberry
Ex-England batter on BBC Radio 5 Live Sports Extra
The capitulation is the worrying aspect for the Invincibles. There wasn't a lot of thought process in some of the dismissals. Before you knew it, the game was over in a flash.
Post update
There's quite a lot to unpack there. The Invincibles slipped from 64-3 to 85 all out.
Lauren Bell and Amanda-Jade Wellington the heroes for the Brave, with three wickets each.
Post update
Aatif Nawaz
Commentator on BBC Radio 5 Live Sports Extra
The Oval Invincibles weren't invincible today. A terrific effort with the ball from the Brave, led by Amanda-Jade Wellington.
SOUTHERN BRAVE WIN
Anya Shrubsole takes the final wicket, and that's not a great showing from the Oval Invincibles.
WICKET
Ismail c Bouchier b Shrubsole 5 (Invincibles 85 all out)
Well.
Invincibles 85-9
31 more runs needed
Shot! Shabnim Ismail thumps Anya Shrubsole for four down the ground.
She might as well just have a swing.
Invincibles 81-9
35 more runs needed
Lauren Bell finishes with three wickets for 22 runs. Not bad.
BBC SportCopyright: BBC Sport
Invincibles 80-9
36 more runs needed
And Ismail survives it! Just.
Post update
Hat-trick ball coming up ...
Post update
Michael Carberry
Ex-England batter on BBC Radio 5 Live Sports Extra
It's, er, not looking good, is it?
Post update
Aatif Nawaz
Commentator on BBC Radio 5 Live Sports Extra
She's gone through her completely! Southern Brave are taking wickets with ease.
WICKET
Farrant b Bell 0 (Invincibles 80-9)
And again. Lauren Bell is matching Amanda-Jade Wellington's efforts here and she's on a hat-trick.
New batter: Tash Farrant
BBC Sport/ECBCopyright: BBC Sport/ECB
Post update
Michael Carberry
Ex-England batter on BBC Radio 5 Live Sports Extra
This is the Invincibles hitting the panic button. It has been a little bit frenetic, to be polite. No real thought has gone in to some of the shots. They are not out of the game in terms of the score needed, but they keep losing wickets.
WICKET
Bryce c Rudd b Bell 0 (Invincibles 80-8)
What. Is. Happening. Sarah Bryce swings hard, but can only get an edge through to Rudd behind the stumps. What a comeback from the Southern Brave.
Invincibles 80-7
36 more runs needed
And breathe.
Amanda-Jade Wellington has four wickets for just 12 runs from her 20 balls.
For the Invincibles, it's 36 runs from 15 balls. There were some loose shots in that flurry of wickets.
Live Reporting
Ffion Wynne and Amy Lofthouse
All times stated are UK
BBC SportCopyright: BBC Sport 
BBC Sport/ECBCopyright: BBC Sport/ECB 
BBC Sport/ECBCopyright: BBC Sport/ECB
Latest PostGoodbye
That's it from us on this game, so thanks for joining us!
But while we wait for the men's fixture, which starts at 19:00 BST, you can follow England's attempt to fight out a draw here.
Post update
There were some errors in the field that they'll want to put right in the final, and they'll be grateful this drop for six didn't cost them too much!
Post update
So if these two teams do meet again in the final, it's Southern Brave who will have the upper hand after this thrashing.
We were wondering how they'd get on without Smriti Mandhana, but they proved today why they've gone straight into the final and won seven of their eight games.
Post update
Michael Carberry
Ex-England batter on BBC Radio 5 Live Sports Extra
The capitulation is the worrying aspect for the Invincibles. There wasn't a lot of thought process in some of the dismissals. Before you knew it, the game was over in a flash.
Post update
There's quite a lot to unpack there. The Invincibles slipped from 64-3 to 85 all out.
Lauren Bell and Amanda-Jade Wellington the heroes for the Brave, with three wickets each.
Post update
Aatif Nawaz
Commentator on BBC Radio 5 Live Sports Extra
The Oval Invincibles weren't invincible today. A terrific effort with the ball from the Brave, led by Amanda-Jade Wellington.
SOUTHERN BRAVE WIN
Anya Shrubsole takes the final wicket, and that's not a great showing from the Oval Invincibles.
WICKET
Ismail c Bouchier b Shrubsole 5 (Invincibles 85 all out)
Well.
Invincibles 85-9
31 more runs needed
Shot! Shabnim Ismail thumps Anya Shrubsole for four down the ground.
She might as well just have a swing.
Invincibles 81-9
35 more runs needed
Lauren Bell finishes with three wickets for 22 runs. Not bad.
Invincibles 80-9
36 more runs needed
And Ismail survives it! Just.
Post update
Hat-trick ball coming up ...
Post update
Michael Carberry
Ex-England batter on BBC Radio 5 Live Sports Extra
It's, er, not looking good, is it?
Post update
Aatif Nawaz
Commentator on BBC Radio 5 Live Sports Extra
She's gone through her completely! Southern Brave are taking wickets with ease.
WICKET
Farrant b Bell 0 (Invincibles 80-9)
And again. Lauren Bell is matching Amanda-Jade Wellington's efforts here and she's on a hat-trick.
New batter: Tash Farrant
Post update
Michael Carberry
Ex-England batter on BBC Radio 5 Live Sports Extra
This is the Invincibles hitting the panic button. It has been a little bit frenetic, to be polite. No real thought has gone in to some of the shots. They are not out of the game in terms of the score needed, but they keep losing wickets.
WICKET
Bryce c Rudd b Bell 0 (Invincibles 80-8)
What. Is. Happening. Sarah Bryce swings hard, but can only get an edge through to Rudd behind the stumps. What a comeback from the Southern Brave.
Invincibles 80-7
36 more runs needed
And breathe.
Amanda-Jade Wellington has four wickets for just 12 runs from her 20 balls.
For the Invincibles, it's 36 runs from 15 balls. There were some loose shots in that flurry of wickets.
New batter: Sarah Bryce