She might feel as bad as you do.

When I got married last year, I had friends come from out of state. I felt so horrible because it was an expense for them! I really wanted to spend time with all of them but it didn't work out that way. Before the wedding things were so crazy with family obligations and stress, during the wedding I depended on my friends to get stuff done and yet I couldn't see them much, and after I barely saw them.

Maybe your friend wanted to see you more than she could but had other things tearing her in different directions. Sometimes guilt (I felt SO guilty during that time) in not seeing you more is making her hesitant to contact you.

I'm just speaking for myself but I know I ignored people who came from out of the country, people who live near me, and people who I grew up with from out of state who came for the wedding Every time I spent more time with "new" friends more than old or "old" friends more than new, I felt bad. I tried to merge people as best I could but then I had both sets of parents to socialize with too....

Might be worth talking to her and saying something like you wish you could have seen more of her but understand she was probably busy. She will probably agree with you and feel the same way and if she doesn't, well, at least you had a semi-fun vacation even though it was Vegas?