My 81 year old Mom is being scammed ( going on 2 yrs now ) She won't listen to reason! What can I do?

My Mom lives in Texas, I live in Louisiana 9 hours away. I have been called by the Postal Service about illegal activity on her part and I had to drive to Mom's to meet with Postal Inspectors. Mom was putting 100 dollar bills into magazine pages and sending them to various people in different states. $ 25,000 was in the last package she was trying to send and did send eventually by other means besides the Postal Service. She has been told she won the foreign lottery (African) of 200 million but that she needs to pay taxes on it first. Mom has paid in excess of 200 thousand dollars so far and she keeps sending money and she lies to me about it! She keeps talking to this man who hounds her all the way to the bank and until she sends the money! She doesn't pay her bills because she says she doesn't know how much money she has. She lies to me and won't let me do anything to help because she says she wants me out of her business! These people now want her to mortgage her home to pay the remaining 130 thousand in taxes she still owes. I found this out through one of her painting buddies. Mom goes to painting class, or she use to before Covid. This man has told her that he works for the FBI and that he loves her. I am at my wits end. I don't have money to hire a lawyer, I just don't know what to do. I have been to the FBI, and other agencies but no one will help. Adult Services called me because one of Moms painting buddies called them and told them about Mom giving all her money away and about being told to mortgage her home to pay these scammers more money.