My earlier post was wrong. Like I said, I thought it could be, because I don't rent and synch. I just rent straight from my iDevices, rather than using iTunes synch from a computer.
I thought maybe you couldn't synch rentals (as opposed to buying movies) because I read before that you're supposed to be able to see a rental only on one device. (I didn't pay much to attention to it at the time, because I figured I'd never to need to see the same rental on two devices.)
Anyway, she should like movies fine on touch once she learns what works best for her. If she has a touch 4, the screen is nice and crisp IMO for movies. Of course, it's tiny, but you put your head close anyway for such a screen, lol. I tried a Yosemite video on my touch 4 and thought it pretty good.
Just a thought but she could browse on your PC then once she has decided what she wants to watch she could go straight to it on her IPod Touch and download it.