Like everyone here said, it has to be taken very seriously, and then dealt with (whichever way it may go).
Only thing about suggesting a therapist is, her parents. Why haven’t her parents picked up on this? Quite possibly they did. But, “how embarrassing it’ll be if their daughter breaks it off” and other fears etc etc. I don’t know her financial standing, but she may be hesitant to go spend a thousand bucks on a qualified therapist, with a proven track record, especially if her parents will know about it. (Divorce court is whole lot more expensive).