(Ironfloor's thread inspired me to post)
An acquintance of mine, who used to be a closer friend and who's DD used to be close friends with mine, asked me back in early September if I could pick up her DD once a week and drop to school. I agreed but now it has got a bit annoying because of traffic and roadworks - she lives 2 miles away on the other side of the city centre, school is 1.7 miles away. She didn't want to rely on her ex to pick her up and her older daughter goes to college although is strangely still there when I pick up. Just got fed up now - never get a thank you from mother or daughter, let alone petrol money (£1 would be nice). Last week, daughter was ill and not going to school - did they tell me? No! Waited til I turned up 
I don't like feeling resentful so thought it best to let her know I'm not willing to continue which I did this morning by text after she texted me "don't forget to pick up x". Cheeky cow.
I feel a bit unreasonable - am I?