Re: She asked me a Favor - Did I make myself too available?
It's a tricky situation. Since your boyfriend, obviously you're expected to pay a certain degree of attention more to her than you would have before. I would say though that there is a point where no is no for doing things.
I do not believe you have struck this point though. She legitimately needs your help, so you should offer it. I would say to not jump into sex so quickly, and I would say to not worry about making yourself too available. By going to the party, you're already limiting your availability. In addition, you're getting her to commit to something that you want in return for your services. You can go to the party, and you can spend the night because it makes it easier to get her the next day. Just don't do anything more than chatting with her for a bit and then sleeping.
"There is no better than adversity. Every defeat, every heartbreak, every loss, contains its own seed, its own lesson on how to improve your performance the next time." - Malcolm X