I use a PS4 controller on PC and it's great! If she already uses a logitech controller then it's the exact same format but in a lighter and more comfortable form, and with much better triggers which are important in this game.

That said however, you do need to install the xbox 360 driver and run a program called DS4 to get it working. Google has plenty of guides for setting all of this up and once you get it setup it's not that hard to deal with.