imo, she's an acquaintance, who thinks that she can expect favors although she is not a friend nor a relative. judging from what you said you usually charge, and what she has offered to pay you, you're not getting paid enough for your work. you're caught between a rock and a hard place now and however it gets worked out, try hard not to go there again. i'll bet she knows the going rates and that's why she came to you, who she doesn't invite to her house. be very, very busy the next time she asks for something or she'll keep taking advantage of your kindness.