No sure of annoyed is the right word to be honest.. Miffed?
She's owes me some money money, not a fortune but about £70. Made up of a few instances of borrowing £20/£30. Anyway DH came home today and said he'd spoke to her DH (we all get on etc) and he told him that she'd spent nearly £400 on their DS this weekend on clothes (from one of those designer outlet places) 
I know she earns very good money, and I understand kids need new clothes (constantly!) but I've seen her a few times these past few weeks and she hasn't offered me my money back. Although I havent outright asked for it back, just more of a "just give it me back next time blah blah"