Should I tell my cousin that I’m pretty sure she has joined a cult?

You can tell her, but don't expect her to believe you.
You might also be prepared for an argument.

Yeah, why haven't you told her already?

Do her eyes look kinda glazed over with a strange sparkle? Does she have this almost fake too wide of a smile? It's often the effect of someone being brainwashed, especially if they start cutting ties with family.

You may want to try an intervention if not too late.

damn...which cult?

F*CKING CROSSFIT!

That would be nice

She'll cut you off cause they are probably already in her head and they will tell her that you are bad. Keep in contact with her and be supportive of her but NOT the cult. She will need someone from the outside when she is ready to leave.

No harm in saying

Yes, probably.

Lolz

nxivm

Yes, I think so. If they haven't already indoctrinated her then she might hear what you say and think about it.

Yes. Although I better not tell my parents that I may off joined a sex cult.

Is it the good kind of cult, with orgies and tentacles?

They don't want him to talk to you?

JWs ??

YES

As long as you understand it’s unlikely to change the way [b]she[/b] feels about the group in question if she thinks she’s getting something from it.