Dsis has a friend who lives about 30 mins away on the bus. She went to stay over the weekend with her DS and DP.
Just got a message from her asking if I will pick her up as she doesn't like getting the bus back alone. (Her DP is going straight to Liverpool from friends house).
She has offered me a fiver which won't even cover my petrol as its a full hour in the car. And my car is a big engine.
I've told her I will pick her up but it will about a tenner in petrol. She says she doesn't have a tenner but she really doesn't like getting the bus. 
She's a fully grown adult, btw. I'm the only one in my family who drives at the min and hate this sort of thing because I'm made to feel like a taxi.
She knows Sunday is my 'day off' as DS is with his Dad and I like to do the shopping then relax for the rest of the day.
AIBU in saying no, given that she has got a mode of transport she just doesn't like it!