I just hate it when you try to be a nice person and say yes when all the time that little voice inside is saying no no no don't do it.....and being the nice person you are you don't listen and it just goes from bad to worse. I agree with many of the other comments ahead of me. I know you said you threw out her phone # so I assume you can't call her. At some time she will call you or just show up then tell her you are sorry for any inconvenience but she broke the original agreement in many ways and you are unable to do this project for her. If the two of you decide on doing this at a later date.....listen to that inner voice and say no no no. She sounds like a person to steer clear of.