I can only give advice as an adoptee myself. While I was adopted at birth, I still had attachment demons and emotional problems to work through during my adolescense, so its not just the older adoptees. There was only one time I got physical with my mom, but the circumstances were a little different. I said something horrible to her, she slapped me, and i hit her back. (I absolutely deserved the slap, no question and no hard feelings only remorse for how I hurt my mom.)
You should meet with her counseler over this but probably not with your daughter present. If it is a joint session dont be surprised if the counseler "takes her side", or if that doesnt happen, your daughter may not want to see that counseler again. Trust with teens in this situation can be tricky. When a teen is in a situation like this they can really feel ganged up on by adults and get more angry rather than remorseful. You did the right thing, sending her to a "time out" to calm down as well as taking one for yourself by sending her to bed is a great place to start. Next step is to taker her out to talk about it by yourselves. Dont do it at home, to avoid a flare up. Dont be accusatory, but speak to her as an adult, and about how you can help her control her anger. She's old enough to know it's a problem.
Part of the ups and downs could be her way of reaching out, then pushing away so she doesnt get too attached..., she may be looking to see how far she can push you before you dump her too.
Then, (i hate to say this because it seems like rewarding bad behavior, but It could help bridge the gap even for only a week)take her to do something special like a mani/pedi, or lunch and shopping, or lunch and a movie. Dont give her the choice, just tell her to get dressed and its a surprise. Bond with her. Dont talk about the event at that time, dont talk about grades or chores, talk to her about friends, and boys or anything that interests her this week. Most of all dont judge. She needs to know that you still love her and care about her interests. Plan these outings monthly, and dont take them away as punishment, cause in the long run it will be punishing yourself. Take her out once a month whether she's good or bad, and dont talk behavior, just bond to remind her that love IS unconditional, and not everyone leaves.
This should curb some of the problems. I would get involved with her teachers to find out if she's acting out there, and if so talk to the counseler about it too. then work with her teachers on how you would like to see them discipline her while in class so that there is consistancy.
My mother tried ot get me diagnosed as bipolar, etc, and I was put on three different meds, which I really didn't need and while they calmed me down so I was less of a problem to others, they gave me some very strange feelings, and it almost became a bigger problem towards myself. Unless she truely has a chemical imbalance (which is still really rare) I believe that more often, cognitave therapy is far better and fixes problems more often than through meds. Meds only serve in many of these cases to cover symptoms, but addressing the actual problem is far more important and will help more in the long run so that she doesn't have to spend her life in a stupor. (they tried to tell me I would not be in a stupor....I was so foggy that the year they had me on meds is a blur and I have very few memories of it; none positive). If she's already seeing a counseler medicated necessity disorders should have already been addressed and discussed. based on your post it doesn't seem like that is the issue, and it's purely behavioral.
Now, Honestly, my mom and I weren't sure Id make it through my teen years, 15-16 was really BAD, but once I went to college and saw that there are a lot of kids out there whose lives are soooo different, I called my mom repeatedly to apologize. She and I became really close by the time I turned 20, and now are best friends. I live far away still, though hate that I can't see her every day. If I was closer, trust me I would spend as much time with her as possible because she is truely my HERO! So trust that it will get better, because your daughter is blessed to have a loving and wonderful mom who CHOSE to be HER mom, and she'll recognize that.
Good Luck, and remember that you are doing a great job, and it's not your fault and it will get better.