Hey, I'm not sure if this helps and is probably a somewhat wacky and labor intensive idea - there's a terry symmetry on ebay that ends in a few days with a 26" standover.

http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA:IT&ih=017

So height wise, i'm sure it'll fit her. Components are old 7 speed, however, and you might have to do significant tweaking or swapping out of the stem, saddle and things like that to get it to fit her right, and your local bike shop might be able to help you with that.

And then given that it's a 7 speed, you might want to make it more modern... however, you were willing to put her on a fixie, so a 7 speed triple might be fine for now while she's figuring out what she really wants in a bike...

And later on when you guys have more an idea of what she really wants, maybe you can convert this into a fixie or a commuter for her.