You're near Philly, right? Shops I've been to in the area have some 686, Volcom and Ride outerwear in their female selections (in addition to Burton, Foursquare, Oakley and others). I've worn other brands so I'm just going on what you'll find that she might like. Some people swear by 686 and Volcom.
As for Betty Rides..a shop person told me that it seems to be geared toward the teenage/tweenage age group thus sized accordingly (short!). Which might work if your gf is in that age group or because she's petite.
Just look for quality materials that meet tech specs for where she'll be riding and what will work for her.
Also. Check out the link BA posted in his 2012 Outerwear Review thread. There are chick reviews included.