Mental Health Problem. Should be done?

Hi, my friend had very tragedic life & she lost her bf due to her nature, she is very impatient, she couldn't bare if something is happening against her mind, sometimes she is all fine but suddenly she starts irritating & talking about past, she feels frustated , sometimes she feel bad & emotional for her family & later after remembering something she also start abusing. Main problem is she is not ready to consult any doctor, she was earning very good salary but she left her job & says now she dont want to do, her living is difficult now & she says she want to get married but she dont select any guy, her parents are getting very weak to handle her & she is out of control to them,she is very well educated. she dont sleep properly in night, she just eat so much all the time & she talks anything which was happened earlier she links her past with anything in future also she talks positive about something now & later she ll talk negative about same, nobody knows what should be done