No, don’t mock her, that’s the last thing you should do, don’t be emotional, be calm and ask her if she want to take the easy money if she is so sure about these things, it has to be provable, objective events where there is no wiggle room, like the natives with arrows for example.
Cults will always want to isolate their perspective members from their current support groups. Don’t let them do that past the point of no return.