E.D.
Y.,
I'm so sorry to hear that your daughter is going through this. I, too, was diagnosed with depression at 18, and the Zoloft I took helped me tremendously. It has been trial and error for me as well to find the right medication, and my doctor and I have discovered that as I aged what worked for me as a teenager no longer works for me now. I will caution you, though, that there are certain anti-depressants out there that for a teenager can make them much worse. I should know, because the first medication they put me on was Prozac, and I was immediately taken off of it after my depression sunk deeper and I became suicidal. My doctor then put me on Zoloft, and my moods lifted completely and I felt normal again. I would just advise you to keep a close eye on her for the first 2 or 3 months, and if you feel she's not getting any better, or is getting worse, get her back in and discuss with her doctor any side effects she had. I'd also encourage her to find support, not just from you, but from an impartial person. Someone she can just vent to without worrying about any repercussions. Whether that's a counselor, or a local support group for teenagers with depression, or even just a couple of close friends, that will also help her.
Please also know that nothing you have done as a mother, or even her happy family environment, could have altered the diagnosis she received. Depression is a disease that stems from a chemical imbalance in the brain, and there is no shame in taking medication to help her get better. My own father suffered from depression all his life, but was so sure that he could just make himself feel better without any medical help, that he spent all of his life needlessly suffering, wondering what was wrong with him that he couldn't just make himself feel better.
I wish nothing but the best for you and your daughter, and let her know that it does get better. I am living proof of that.
Much love and support to you both,
E.