A few weeks ago, I lent a friend £25. We agreed she would pay me when she gets her tax credits again. This week, I bought something for £15 as she has set up a new business making things and I wanted to support her. She messaged me to say it was finished and can I PayPal her the £15? I was a bit taken back and said can you knock it off what you owe me, so you now just owe me £10. She messaged back and said no, she wants the whole £15 now. (She already had the materials in stock so I know she hasn't had to pay our specifically to make my item). AIBU? I'm still happy to wait until she gets paid next for my money to come back. I'm not rushing her on that. But I do feel resentful that she now wants paying?