hi my son went through that a few month ago.taking things that wernt his then showing me and saying look what i found or luk what i got given.i just explained it was naughty and if he wanted something that someone els had to tell me or show me what it was and if i could afford it i would buy him it at the end of the week for being good.and fingers crossed but it has worked so far x
Did you ask her why she does it, what was her answer, she showed you it did she say she was borrowing it, just keep telling her no she cannot do that and she wont go to the firends house if she does take things .Next time she does it say she cannot go to the house and not let her, with school perhaps enlist Teacher to help, as I am assuming she has to return things there.