DD1 (15) has become friends in the past year with a girl from school of the same age.
I vaguely know the girl's mum, but she is always over-keen to offer favours and to offer to do things for DD even though I have not asked for or expected this, however she then suddenly expects me to dance to her tune whenever she wants a favour in return.
It is things such as DD will go round their house for a couple of hours, and will come back and say that she has had a full Sunday roast whilst she was round there. Consequently when the girl comes round here, her mum expects her to be fed, even if it's not a meal time. She popped round one evening last week after we'd had our tea, and went home at about 8 o'clock. Her mum then sent me a text saying was it true that I hadn't given her DD any tea. She seemed quite stroppy, as if she expects her DD to be fed a huge meal as she's done it for my DD.
DD has stayed at their house a couple of times overnight, always at their invitation, and certainly not requested by me. The mum then text me today and asked if I'd have her DD overnight tonight. Her DD is quite badly behaved and isn't the easiest child, and DH has got a bad headache today, plus we are going out for the day tomorrow and leaving early, and to be honest it just isn't convenient tonight. I've just now had another text from the mum saying basically that they have had DD "loads of times" and she can't go out overnight now as she has no one to have her DD.
I have also had this in the past before when a mum of one of DD2's friends wanted to do favours for DD2 and I all the time, then got the hump when I wouldn't do as she said in return.
If I do something for someone, I do it because I want to, not because I expect something in return.