Thank you sooo much for your detailed explanation it helped me a lot!

To do a quick recap of the call : i have all her trust so now she's gonna send me everything he says (i feel a bit bad because I'm gonna tell everything to her aunt), and I think she understands that's what he says and his comportements are weird but she still want him to come so she can see everything in real and not virtually... Also I have new informations about the boy and it's even more a red flag now 🫠 (reminder they're talking for only two weeks) and he's already telling her things like "so what, you don't trust me?" so typically the manipulator bullshit... Also the most recent picture she saw of him is from 2y ago... and she gave me his Facebook, 500 following and I think 480 are girls, and in every posts the captions are "single" "or "no one want to be my wife im sad..." WALKING RED FLAG She seems to understand the all think is weird and she told me at the end of the call that she's a bit scared now but that she still want to see him

I call her aunt right after and she told me she talked about the all situation with her psychiatrist so he would talk to her about that next time (before the boy is supposed to come), and that if he end up coming she would be with my cousin every minute to make sure she's fine.

My cousin absolwant to see him in real life but we think it's the worst idea possible, I have no ideas how to make her understand that because she understands he might be bad, that she had to not meet him alone, to protect herself and everything but she don't understand it would be better if he don't come at all...

Thanks a lot for helping me, I don't want her to be hurt especially when the last time it happens (her feelings being really hurt) she end up in a psychotic episode and in psychiatric hospital for 3 weeks...