My DD has been friends with another girl for about 7 years (since nursery). The other girl's mother had a brain tumour a few years ago, and is still not well. She has a partner, not her daughter's father, who is bi-polar, and who does absolutely nothing. They are very broke, on benefits that never seem to get paid on time, and in a pretty sorry state generally.
The mum has latched on to me as some sort of saviour. I help out when I can - she babysits for me sometimes, but needs to be picked up and returned home because she can't walk very well ( it's a 1:4 hill to her housing association home). She often asks for a loan or a lift somewhere, and says she doesn't know what she'd do without me.
She is not someone I would choose as a friend, and although I feel very sorry for her, I don't know how to back off from her. We are not well off ourselves - I work and have a mortgage etc to pay, an overdraft and credit card bills, and now my car's in the garage, but it's so hard to say no to her. My DP thinks I'm being 'good', but I'm starting to feel resentful. Any (helpful) suggestions?