what do I do? Need advice

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I need some advice from everyone I won 6 tickets to an event so invited 2 other couples to come with me and my husband. Everyone said yes but my friend said that she needed to check with work and would let me know if she couldn't go. I was talking to her for the following week and she didn't say at any point that she couldn't go. We discussed the route driving there, attractions nearby that we could go to, a night out in the nearest town, etc. I should have asked but I didn't and thought everyone was going so I booked us a cottage and everything was set. 2 months later, the deadline for the cottage money was coming up so messaged her about getting her money for it and she got defensive saying that I should have checked with her before booking because she wasn't going. She had 2 months to tell me but she didn't until I brought it up again. What hurt more was that our husband's got involved and her husband sent my husband a message that basically said they were never planning on going on the trip with us. When I asked her about it but she didn't reply, she then blocked me on facebook without a word. I found it very hard to believe that she didn't just tell me she didn't want to go in the first place and then instead of talking to me, she cut me off. I don't know what to do