Hello, Morkpaz, welcome to the Depression Forum, and hopefully
someone here will offer some suggestions, as well as Jim's, that will give you a glimmer of hope.
Have you thought about calling the boy's parents (his father, particularly) and having a talk with him about co-dependency and how it is affecting your child? The boy may be too young and not knowledgeable enough to back off a little to give some room for more
people as friends in your daughter's life. The teenage years are very much like trying on different outfits of clothing to see which one fits most comfortably.
Your daughter is in a quandry because, while she wants to be obedient to her mother and father, she has an almost addictive attraction to this youngster as a co-dependent. Taking her out of the school is one
choice or letting her live with an aunt or uncle for a year (if they are
willing to permit it) might move her away from the dependency and
help her to mature a little.
Letting her continue to talk with her psychiatrist could be an excellent route to follow to help her understand co-dependency and the illusion of love. When first love strikes, it is very painful for it to end, because youngsters don't have the tools to know what's really happening in the relationship. They know only the depth of their feelings, and feelings get in the way of thinking for young people sometimes.
I'd choose to keep her in therapy and talk to the boy's father, I think.
Running away to an aunt and uncle may help, but sooner or later, she will need to face the reality of a relationship that is mature, and I wonder if she will be able to manage that without prior experience of knowing what immature relationships are like. The experience is so painful in first love and in co-dependency relationships.
The boy's father might wish to talk to his son, as well, to explain how
the friendship can be too much for them to handle at this young age.
Both his guidance and your daughter's guidance are very important at this time in their lives. Please find the time to give it to her as she needs it, and give her the confidence of coming to you and to your wife for help when she feels she can't handle it.
You probably have a beautiful child who is just beginning to grow into
young adulthood who needs your love, compassion, and leadership more than you know.