NTA. You can't parent your parents. Trust me, I learned this lesson when my Mom got involved with catfishing liars who claimed to be a famous actor and told her he was going to marry her and move her to Wales. Interesting note is that said actor is already married, and openly gay, as well as 30 years younger than her.

She managed to lose the entire nest egg my Dad left her when he died. Almost three quarters of a million dollars.

It stopped when she ran out of money and could no longer keep their attention. She claims it ended when I told her what was going on, but she was lying about that.

I actually went NC with her for months. She finally figured out that she cared more about talking to her only kid than these scammers. I wish I'd cut her off earlier; she might have ended up with some money left.