I feel used by my friend and want to set boundaries

Sorry for the long text, but feel like details are important.

Me and my sister(27y/o) planned a trip to Vienna. I booked everything. Once I was in a cafe with 3 friends (not too close) and told them about it and that they can also join. One of them asked right away if she can stay with us. She is a working student in Germany and has been looking for a full time position for a year now (and I know how hard it can be), therefore I felt bad for her and said yes, please check if there is a couch you can stay with us, I booked it anyways. The morning we were supposed to take the train my sister’s flight cancelled and I was really sad because I booked the trip for her to experience Christmas in Europe, but I still did not ask the girl to cancel the trip bc she already got her train tickets. We took the train. When we reached the airbnb, there was no couch, she asked if she should send me the money, and that she initially planned to pay for some dinners for me and my sister for letting her stay with us. I was feeling bad for her, did not want to put her in a bad situation and as a good friend said “no, since you would not come if you knew you were going to pay”. And she was of the same opinion. During the whole trip she followed her plans, I was alone most of the time, like the second day she went to a palace that I did not want to and then did not ask me if I want to go to a guided city tour with her. (That did not feel nice, as me and my sister were not going to leave her alone for our own plans. Before the trip I even sent her the concert we were going to attend and had tickets for long ago, so that she does not have to stay alone while we are in the concert) I still texted her during the day letting her know where I am and saying she can join. But she offered to meet at the opera for the ballet. She bought the tickets and I did not even offer to pay bc she did not offer to pay for anything an as she said. For instance we went to a restaurant the first day and my bill was 5 euro and she told the waitress right away that we are paying seperatelly. During rhe same dinner I said sth about me not being able to eat a lot and saving money through that, and she said that I am looking down on people. She was passive aggressive and distant during the whole trip. I was askjng her constantly how she feels. She would not really talk to me unless I asked her sth. I feel like I am used. Also she was counting every penny she spent and planning another trip at the same time, while I am cancelling my next trip plans, because I spent a lot of money now. I feel like I am used for money and she does not enjoy my company( I mean she did not even consider how bad it feels that my sister could not come). I am thinking of asking for some money for the accommodation first bc I am angry and don’t want people to take advantage of me, secondly I feel like I could use that money on my real friends, family or an upcoming move to another apartment.

What do you think I should do?