I don't have a child with those issues but when I was 15 I went through my first really serious depression, and over the next five years or so, I made my parents lives hell. I can say that she doesn't mean to hurt you. For me, it was so confusing, I didn't understand why I felt so awful all of the time, until I'd hit a manic phase and then I was on top of the world, until I crashed back down. Her perceptions of situations are altered by her sickness. The chemicals in her brain are causing her to feel irrationally upset, angry, and I gaurantee there are times she knows that, but you often feel powerless to change it.
Finding a therapist that she's comfortable with is key. I've only ever been to one that I could really talk to, and believe me, I tried a lot of therapists! As far as medication goes, I firmly believe it works, but should be taken very seriously, watched carefully, and should be the last resort. Some medications actually make it worse,which happened with two types for me before I found the right one for my body chemistry, it's different for each individual. With the combo of therapy and medication, I learned to effectivly manage my illness, and now, I know it well enough to control it. I actually majored in Psychology in College in order to understand it.
As far as the ADD and ADHD, I'm pretty sceptical about that. My mother is a special education teacher. She also does screening for the entire county. She's seen it all. She told me that they slap the ADD, ADHD label on WAY too many kids. She says, can your child sit down and watch a movie, play a video game (basically, can they consentrate on the things they enjoy?) If they can, it's not ADHD/ADD. A lot of the symptoms of bipolar disorder and ADD/ADHD are the same, so they just slap a general list of labels on the kid and pump them full of drugs that they're not even sure they need.
Does she have an outlet? Does she write, paint, sing, play sports? If not, help her find one. It won't fix her, but it'll help.
As a parent, from the point of view of hindsight, just be understanding. Be her shoulder to cry on, make sure she knows you're always there. Try not to take it personally, like I said before, she'doesn't want to her you, it's not her, it's her illness, and lastly, do not bend your rules to compensate, she'll just feel more lost. Regardless of what she says, she needs structure, and accountability. Otherwise, she'll never learn to control it.
It may go away someday, or it may be a lifelong illness, but, for me, it's no different than haviong diabetes. I need to take my meds, and when I feel an iossue coming on, I know I need to see my therapist and try very hard to focus on the positive things in my life. Actually, I think it's made me quite a bit stronger than many others, and also, more in tune with others feelings.
I really hope this helps you. My worst nightmare is that it's genetically passed down to my daughter, who now, is only 1 1/2 years old.
If you're in the Northern VA area, I can give you the number of my counselor, who is really fanastic! Let me know!
Best of luck and God bless!!
M.