Should I cut this relationship out of my life ?

So this all started when I got to know A , it was about six months ago on a meetup group on Facebook. A is a few years younger and has recently moved to Germany while I’ve lived here for six years now (originally we are from the same country) . As I know how challenging it can be I like to help newcomers like A. During the last few months I helped A solve many problems starting with the heating in her apartment lending her a mattress (witch she forgot to drive back therefore I had to pick it up myself . ) making calls and translating letters . Every single time A had a problem she came to me (even basic things she could find on google easily A would come and ask me instead )A is unemployed engaged and living off her pretty wealthy parents ) I’m a student working hard to keep afloat without asking for help from my family. Two months ago A asked me to watch her dog for a few days (I’m a doggie sitter and do this as work ) I didn’t ask for money but assumed she would at least take me out for coffee or something as a thank you . Moreover she left the dog for twice as long then what was planned harming my work schedule. A has asked me to watch her dog for a long weekend yet again I said ok . The long weekend became a month (she only let me know about this a few days before her departure) I personally feel nearly a month is to long to watch anyone’s dog for free even a friends (and most of my clients are friends ) . Moreover A forgot to give me back money for groceries I purchased for her several times . When I told her I expect some kind of payment for watching her dog for this long (normally I get 70€ per day I asked for 70-80€ per week as a friends price) she immediately lashed out at me and said it’s not normal to pay friends . I said it’s normal in my book . Not even my boyfriends family asks us to take the family dogs for a months and it’s family . Am I in the wrong for saying no ?