piece of mind

I think I'm doing better now but every night I slip into the same routine. My best friend and I have planned our dream trip over Christmas and are in the process of booking everything but all I feel is stress surrounding it. So far I have booked and paid for everything (flights, concert tickets, accommodation etc) with money I have been saving up all year from my job and have continuously asked for the money she owes but all I get are excuses. Her parents are paying for her entire half because she doesn't have a job or savings and I'm starting to think this was a bad idea. Before, I would've done anything to go on this trip and especially with my best friend that appreciates it as much as me but now I'm questioning everything. We're both adults and I just hate how much pressure she's putting on me. Void, what do I do...