Montrose's second-half comeback fell short at K-Park as Motherwell's winning start to the season continued.
The hosts scored three times in the first half to put themselves in the driving seat.
Morgan Cross opened the scoring before Rachel Todd's penalty made it two. Bailley Collins grabbed the third with a cracking solo run and finish.
Louise Brown and Holly Daniel found a response in the second half for Montrose but it wasn't enough to snatch a point for Craig Feroz's side.