my wife rides a 48 and she has a 30" inseam
I really hope the bike conversation didn't go like this "I 'm getting you a bike" "ok whatever" if it did get her something else she isn't into bikes too many dudes get their girls bike because they think it would be great to do but they aren't feeling it 90% of the time
plus you get more brownie points when you ask her exactly what she wants in a bike and build it for her