NBR ~ Visiting an old friend

So I'm a little torn on what I should do and looking for some insight.

I had planned on going to visit an old friend, she was in my wedding and we used to be roommates. I haven't seen her in about 4 years. We keep in touch but not as much and it's usually me who initiates the contact.

When I emailed her with the idea of me coming to visit she responded and said she was looking forward to it. I have since emailed  her 2-3 more times about flights, dates, and such but she hasn't emailed me back. Side note: I also found out that she has a blog that she never told me about but all our other mutal friends have been posting comments on her blog for 2+ years.

I realize our lives have changed and things are different now than they were 4 years ago when we were single and childless but I feel like she is avoiding me. I gave her an out the first two times I emailed her but she said for me to come. I am just getting a funny feeling about her actually wanting me to come.

Also, the flight is very expensive so if I spend the money I want to be sure I'm wanted and if I'm not, well then there are a lot of other places I would love to go visit.

Any advice?