You know, not to complicate things, but I think you should take friend #2. Friend #1 didn't respond for days...so I think it's perfectly reasonable for you to say that when you didn't hear from her, you asked someone else because you needed someone to go. She really shouldn't be mad then, and it's not YOUR fault that she didn't respond sooner.
Good luck, and I hope you have a GREAT time no matter who goes with you!
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