Don't know this person's circumstances to be able render a judgement in her case specifically, but given the amount of unhappiness that's prevalent among young people, I wonder if the ubiquity of media (social and otherwise) is creating unrealistic expectations about life.
They're inundated with imagery of other people living in wealth, excitement and happiness; and, in their minds, their lives may not measure up. What many young people don't understand is that they're only seeing what other people want them to see. Most of what they see is an illusion, because its either a complete fabrication or its only the "highlights" of other peoples' lives.