Why not let her pick out a new bike as well?
You'd just have to know her ... she's the most unassuming, unselfish person on the planet and will be perfectly content starting with an older, used bike that is in good condition ... she's not into jewelery or new cars or keeping up with the Jones' ... if she ends up liking biking, we will most defintitely upgrade her bike, but something like the bike pictured in the previous post seems to be the perfect, inexpensive way to experiment with her.
Bill