Whatever brand you go with, if they have a women's specific design, it will fit her better than a men's bike. I have a LeMond road bike and my wife has the women's specific version (made for shorter torso, longer legs, narrower shoulders), and my wife very much enjoys her road bike, moreso than if it was a small men's. Two examples are Giant and Trek (sure others have bikes designed for a womans physique but these are just two examples). Giant has their Liv bikes:
https://www.liv-cycling.com/us and Trek also has them:
https://www.trekbikes.com/us/en_US/b...-bikes/c/B504/ .