How to convince my mum to stop getting scammed by MLM companies

So my mum chanced upon this MLM company called "Summit International Lily Singapore" and bought a heating mattress (thin ass mat in my opinion) for SGD 5.7K and 3 pieces of shapewear (literal taobao stuff) for 2k. They apparently sweet talk my naive ass mum into buying those items, saying that the mattress will heal all sorts of illnesses and the shapewear will slim them down without working out like wtf is this bullshit HAHA like i rather she use the money for 4D/Toto or even the casinos. I’ve tried my best to convince her not to buy the items as they are SCAMS!! i even showed her proofs and those reviews posted but she still went ahead with her purchases...she even said oh those reviews posted are fake...and that she will check with the sales rep?!! like omg...she’s only in her 50s😭😭😭...why is she js so naive and falling for these scams...even my grandma has way more common sense than her.