not if she plays a lot of video games. i played the old version when i was 12 and my 7 year old cousin (13 now) had to bail me out all the time. he beat it a million times and he's already beaten this one and said that it's no more difficult than the old one.
Yeah, a 7 year old might have a little trouble with it (damn you water temple!), but I'd still recommend getting it for her. Also, she really shouldn't have any problems if she looks up a walkthrough online, plus the 3ds version comes with in-game tips to help new-comers. It's truly a fantastic game, one she'll come to appreciate even more with time. Plus, better to get kids in Zelda than horrible franchises like Call of Duty :)