What would you do about this? (family related)?

My SIL called last night, and since my husband was working a late shift, she talked with me about this instead. I guess my MIL is quitting her regular 9-5 job this morning to do this scam-sounding telemarketing thing. I guess it is a "commision" based "job". People hang up on telemarketers, they dont even listen, let alone buy things, I dont understand how she sees this as a way to generate income enough to survive. She is already really struggling financialy, even working 30 hours a week at a normal job in a senior care home (which I guarentee she earns more at than she ever will on commission based telemarketing). The worst part? The reason she didn't tell my husband is because she KNEW he would come over and try to talk her out of quitting her regular job for it. So she obviously knows its not the greatest idea, but now my husband is in a spot because he doesn't want to see his mom struggle more than she is now, but how is he even suppose to talk to her if she specifically tried to keep it from him? Yes, he knows his mom is an adult, and can do what she pleases, but the last time she did something like this (yes, this has happened before), she was out of real work for 2 years, and we supported her financially, or else she would've ended up destitute. Not only does he not want to see his mom dumpster diving for food again, we also aren't in a financial situation at this time to support her and ourselves again. None of his other siblings are financially able to support her either, and we are really hoping she isn't trying to depend on her youngest sons income as the main household income (he is 18, and just got his very first, part time job as a dishwasher, which is not income enough to support 2 people). What should my husband do? I feel so bad for him, he is in a really difficult situation with this.