Mum buys me random things which she thinks I'll like when she's out shopping and leaves them at my house when I'm at work. All very nice but I'll also receive a text saying "I bought you XXXXXX and left it at yours, you owe me XXXXX". It's annoying me a bit now as I don't ask for these things and I'm pretty skint at the moment so could do without a tenner here, a fiver there.
I'm about to send her a text asking her to please not send buy me anything else unless I ask her and give her the money prior to buying it. I know she'll get upset as she thinks she's doing a nice thing. How do I word it to cause the least upset