How do convince someone to keep crypto in a hard wallet?

I have a friend that is really invested into crypto. She is very enthusiastic about it and I learned a ton about Bitcoin and crypto from her. But then she told me something that scared me: she keeps ALL her Bitcoin in the exchanges rather than a hard wallet.

I told her that was a security risk, she could get hacked, the exchange might play dirty with her money in the future, the exchange could disappear. Her response was that I was being paranoid, that her exchanges are safe, and that she is pretty careful anyway so she is certain hackers won't get her.

How do you convince people like that? I am worried Murphy's Law will hit her badly and she will lose her funds.