Welcome to the board.
I can really relate to your post. My dd is 24 now and things are much better, but I sure remember what she was like back then! She also has ADHD, in addition is bipolar and was diagnosed with ODD (Oppositional Defiant Disorder). I read everything I could find and tried any technique that made sense to me. If it worked I kept it in my arsenal and if it didn't I just moved on. I'll share a couple of the ones that were most effective for me.
The first is the "HUH" technique. This is for when she is on an hysterical rant, typically screaming how much she hates you and that she hopes you drop dead. Ignore her. Totally. Just keep on doing whatever you are doing. She does not exist. When she finally tires and stops to draw a breath, look at her like you just realized she was standing there and say "HUH?" like you didn't hear a word she said. The first time I did this my dd went through the entire thing twice and drew breath for the third time before she realized what I was doing and stomped off.
The second is for when she threatens you with...whatever, if you try to discipline her. This one takes practice. I used to talk to myself in the mirror until I could say it without even thinking about it. For this to work you MUST stay calm. Write down everything she threatens you with and decide what consequences you will impose for those things. Then practice saying "Whether you (blank) or not, the rule is (blank) and the consequence for breaking it is (blank). And if you DO (blank), in addition you will have the consequence of (blank)
"Whether you run away or not, the rule is home by 11 o'clock and the consequence for breaking it is 10 o'clock curfew for the next 3 days. If you do run away, we won't stop until we find you. Once you are home you will still have a curfew of 10 o'clock for 3 days and in addition, you will lose your cell phone for a week."
"Whether you feel like killing yourself or not, the rule is you will speak to everyone respectfully and the consequence for being rude is no phone tonight. If we feel you truly do want to harm yourself, we have no choice but to call 911 to have you admitted to the hospital for evaluation."
She might very well be depressed. In children and teens depression can mimic ADD, and can also cause extreme anger. Good luck, and let us know how it's going.