I want the money my friend made from selling my desk for me.
What is preventing you asking for money?
I'm afraid that she would not agree to help me in the future
It may seem a bit awkward to ask her for the money, but it is something that she owes to you. Just make sure that you thank her for her help, and let her know that her effort was appreciated.
I don't think that you fully know my friend or how she'll react to this situation. I'm doing the right thing here.
I might not know your social dynamic but it was your desk and money. Maybe you can give her a cut of the price like a 10% finders fee. I think that would make her inclined to help you again.