Having to turn down a friend

Today I had to turn down a dear friend, someone I care about. Previously I had arranged for her to stay in my room that I rent with the approval of my friend and landlord, Joy. She had said she would stay one night. Then it became a second night. After that she was told she needed to leave. The following morning she was told she needed to leave right away per Joy. I delivered this message. After she left, I loaned her $200. Today she asked for more money as she was stranded in Nevada. She should have been able to make it much further than Nevada, if not the whole way. Today I told her I hoped things worked out but I couldn't help her. I feel I am enabling her. I also feel I need to set my own boundaries, to work on them. I'm not helping her by enabling her. She's not going to grow if I keep rescuing her. I have a tendency to want to rescue my friends but it's something I need to stop doing. They need to be able support themselves, not depend on me. It was difficult but I feel it was something I needed to do.