Rent on mountain, not in town. If her boots hurt, your f#&%$ed so it's best to be able to limp down, trade up and try again. Buying gear on a never boarded GF prospect is boggling my 48 year old brain..
If she gets up and rides, great. If she sees some chick with a chick board she digs, great.. Christmas just got easy..
You also now know what boots she likes!
Dont be stoopid. Man I wish I had your problems..
Here is a thought... I live in Florida, My Sis lives in Denver and is an instructor at Winter Park. We go every year. I never buy skis or boards but I do make sure everybody owns good quality boots that fit right.(3 kids, not cheap) We fly in, get our boots from aunties basement and rent skis or boards on-hill. Been working for 10 years. Just get her some comfy stomps.