I'm sorry to hear that. It's even more complicated if your aunt is still in charge of herself, believe it or not. Seniors often get confused and upset by disturbing news, they want to avoid family conflict, and they tend to trust those that visit the most. If you are not a legal conservator, the best you can do is be family and visit regularly and be involved. The more eyes on, the more you force questionable behavior to come to light. And, if you have to, report criminal behavior. Law enforcement does have amazing powers at blocking activity further.