First of all congratulations WK!
Clearly I've been gone for longer than I had thought.
Anyways, I agree with everyone else that says to ask her but if she won't tell you then get something you like. One thing I would suggest is to compare different stores on the same day so you can see the quality differences back to back. If you have someplace like Shane Co that carries a variety of loose diamonds that's a good way to figure out what you like/want to spend. (if you want to go the diamond route that is)
Good luck!