Not an AIBU (yet!) but rather what would you do in this situation.
My child has qualified for the second round of sports trials that will be held in the evening, 45 mins drive away. The school has asked that parents non-attending should arrange a lift. Taxi would be over 100 for the round trip and I just cant afford that right now. Buses are infrequent and a nightmare as I'd have to take my other kids too. I cant drive at the moment due to a medical condition.
I dont know the other parents of the other children that have qualified (bar one, but we smile and wave- we dont know each other as friends per se).
Would I be unreasonable to ask this lady if she would give my child a lift there and back? I would of course pay for all petrol money and get her a gift to say thankyou- but I feel as though I would be being a CF to just ask. 
On the other hand I could ask the school which parents have children going- but that seems... well a little childish to have Teacher ask on my behalf!
I just dont want to be a CF to either the school or the other lady.