Money or friendship?

Money is important to me and recently my housemate bought some clothes using my money. She says give me back but she only now give me little money and ask me to buy things for her. She knows that I need the money but she will pretends that not hear a word from me.

She purchase two pants $20, then the tiger tee top $28 if not mistake for the price. So she supposed to give me back $48 but instead she just given me $40.

I cherish friendship but I do no like her to owe me money!