Well, I will tell you what you could do. If you have a friend who could act the part. I did it for my friend whose grandma was about to get locked deep into a scam. I to visited her with a fake FBI badge and other props ( i.e someone rings me and discusses the case over the phone)

I told her I have some questions about a suspect the FBI have been tracking . I told her we tracked him and found she was one of 18 women the scammer was chatting with ans supected of stealing over $4m from 8 victims. I told her the suspect is from Nigeria and he has an accomplice in the US ( insert random state) Asked her if she had communications with the scammer blah blah. Asked to see them, phone numbers, etc

I explained the scam and told I know what they would had told her, also showed her video on youtube of clips of victims etc Told her we are monitoring his interactions and looking to send to arrest his coconspirators - warned her that she was dealing with an organized gang, advised her to cut contact blah blah. She was pretty shocked. Yeah but sometimes you have to think outside the box.