I took DS to soft play yesterday afternoon which happens to be near my cousins who knew I was going down that way.
As I was leaving the play center she text me and asked whether I could pick her up some cigarettes from the shop and drop them round, telling me she has the money with her but doesn't fancy going out.
I get the cigarettes and nip them round, she takes them then apologises saying sorry she thought she had £10 in her purse but she hasn't, then hurried indoors and says "don't worry you will get it"
Aibu to think she did that deliberately, as surely you'd double check and make sure you have the money before you ask somebody to do that.
If it was me and I was genuine, upon realising I don't have the cash I'd have called and said not to bother getting them as I didn't have the money I thought I had.
It's only £10 but it's the principal, as she has form for being a cheeky F.