Hey there! Congratulations (soon!!!)!
Just wanted to chime in and share my experiences. One piece of advice that my mom and stepdad gave me were that, when it comes to big life changes like weddings, and (sadly) funerals, and other such life altering events, you really find out who is really there for you, and who your real friends are. This happened to my mom and stepdad at their wedding, they lost a couple of friends because of some sticky issues.
In my case, I lost a bridesmaid and a friend because of money issues, but also because she was just mean. I had known this girl for 10 years and asked her to be a bridesmaid, and that turned out to be a big mistake. At first she was very excited and seemed to be "honored" that I asked her. I even sent her flowers and a card asking her. Then after that she started to give me a lot of problems, some of which had nothing to do with the wedding. She ditched me on my birthday at the last minute saying she was "busy" and that's all the excuse she could give me, she told my mom she would be having dinner with us and then yet again bailing at the last minute, and then when it became time to go bridesmaid dress shopping, her true colors started showing: First I just want to point out that she only had to travel about 1 1/2 hours to Disney, so there are no travel arrangements necessary for her. No hotels, flights, anything. I talked to her and the other bridesmaids about what she was comfortable spending on her dress, shoes, etc. I set a limit and told her we would not go over $200 for
everything including dress, shoes, etc. and that if it did I would help with the cost. She told me she was fine with that. Well then she started getting a little "psycho" and demanded that I get the bridesmaid dresses from David's Bridal because it was more convenient for her, and started asking me how much dresses cost and I told her I thought between the $130-150 range was about average, and she did not like that. She then started accusing me of withholding information from her, saying that I already picked out a dress well before we went shopping that she thought was somewhere near $400. Um, what? No, I did not go bridesmaid dress shopping yet, and I would not expect anyone to pay that much for a dress! She also actually said to me "well it is your DUTY to get us bridesmaids gifts." I could NOT believe she actually said that to me, I was completely shocked. Yes, I was already planning on getting them gifts as a thank you for being there for me, but, really? That would be like me saying "well I'm the bride and I demand a gift." Who says things like that? Well a little while later I get a TEXT from her taking herself out of the wedding, saying the cost was too much. And we hadn't even picked out dresses yet. Yeah, thanks for the text. So I was like, good riddance. After her bailing on me more than once, I was worried she wouldn't show up to the wedding. About a week after that we picked out the dresses and she wanted to know how much they cost, and I told her it was none of her business anymore. Well, she did not like that and started saying some really, really nasty things to me. All I then told her was that she was no longer invited to the wedding and I did not want to speak to her anymore. I should point out that she wasn't the greatest friend even from the time I met her, so I was kind of thinking to myself "why did I even ask her in the first place?"
Sorry this is so long, just wanted to share my experience with a bridesmaid who said something totally off-the-wall. Unfortunately, these things do happen, I think they happen more often than not. I'm not by any means trying to say that your friend will be awful to you like mine was to me, just saying that sometimes when there's a big event, people can surprise you. Maybe, now that she knows that you want your wedding at Disney, she'll have had some time to think things through to see if it would be possible for her to be there, and it won't be a problem for you at all.