There are a lot of great suggestions here, but if she's never ridden a bike before, I wouldn't go with a two stroke. IMO, There's a lot more skill necessary to ride a two stroke than a four. That being said, I'd go with the TTR125LE. I have one, and I love it...the only thing may be the height, I'm 5'5" and when I'd ride in the standing up position I felt a little hunched. But, it's the big wheel version, light to pick up and whip around (I can load it in and out of our enclosed trailer on my own), and it's got an electric start.
Good luck with your bike shopping!