My mother is addicted to thrift shopping

My mom will go to 8 thrift stores sometimes in a day. When the store closes she just goes to another one. My mom usually spends $60 $100 at a thrift store and she has also bought new shelving to store all the jewelry that she doesn't wear. She buys so many clothes that will never fit her and just sit in her closet, there's just boxes of stuff everywhere 'and she will never use 90% of it. She has canceled doctors appointments to go shopping. When anybody tries to talk to her about it to just ignores us or she acts like it's funny, she doesn't see it as an issue. Sorry I just needed to vent I'm just very frustrated.