Well if you don't mind something a little older I have a raleigh M800 from 1998ish that is in pretty good shape, put a new fork on it 3 years ago and converted the front to vbrakes. Its either a little bigger or more of the old stretched out riding style so it fits more like an 18.5. If she is 5'6" or taller it could work for her. I'd sell that one for $100.