In answer to your question, Cosmic, I think I would definitely say something. There comes a point at which it may be too late - for the time being - but if your cousin is just enquiring about it at the moment, it may not be too late for her.
There was a page written backaways for this sort of situation but I haven't a link to it, if it's still indeed current. If someone doesn't help out with a link to it, why not link her to Timeless Vie as a first step?
You might even get her to come visit us here in the end. 