Step-by-step explanation:
Communicate: I would do the following conversation with her.
1) Look, speak up, tell me what happened. I am here to listen to you.
2) What thing is bothering you?
Offer Help:
1) When i will know about the problem, then i will be able to solve it.
2) May be i could help you in bringing you out of this phase.
Get Help:
1) Lets go out in the fresh air for some time.
2) There is a friend of mine who is able to take you out of the this phase, lets go meet him. ( i would take her to a psychiatrist, but cant say this to her openly).