"bored, watching T.V, in bed etc."
what's wrong? men do it all the time
she doesn't know who i am. I am an E-mentor at my university and this first year student has emailed me with this 'problem'.
I didn't get the impression it was a come on....
I think the issue/fantasy is in her head, and not in her body/hands/action. if she's a teenager, it could be both the fantasy about 'body' and the obsession with you. She may be meeting her needs by talking to you about this. (And I don't mean she is weird)
Then there is the possibility that she is 'touching' herself, unable to 'stop' as a way of coming on to YOU, the mentor?
I would encourage her to see a therapist if she feels like it is becoming a problem and she can't control it.