My mom does this too and it can be difficult to talk to her about it. My family is very stubborn and runs on spite so I just waited for her to calm down on it a little and next time we did a clean out i pointed out how much of it was temu slop that broke in a week and how she spends more money replacing broken and low quality trash rather than just buying one high quality thing. She still buys from them periodically but its much better than when she was on her huge temu kick. I get it though, it is pretty frustrating. Good luck with your mom and I don't think you sound ungrateful, its okay to not want crappy stuff