I am so sorry you yet again have to be the strong one! I know exactly how you feel...and if there is a spa weekend in the future, just let me know! I am free almost all weekends this spring except this one and Mothers Day...
My own son was home schooled on 2 separate occasions. The first time was his first year of 7th grade. We did something called "split site" where he went to school for science and PE and then came home at lunch to do the rest of the work. This system involves getting the curriculum from the school and meeting with an "Independent study" teacher once a week to get the HW and the "lesson"
This system worked pretty good as long as I was available when S came home from school. He would have lunch and I would get busy around the house and he would work on school until he was done for the day. Things fell apart when I went back to work and he has more time on his own. I think one of the things that he really was enjoying about the situation (although he wouldn't admit it) is that he had 3 hours a day of my attention. Later on when he was flunking out of HS my H and I were at our wits ends wondering how to deal with him. (This was one of the MAJOR stressors of our M, btw) S is extremely bright, he was reading off the charts in 4th grade. He loves to read and is quite a thinker and very creative. We tried everything the schools suggested, but nothing worked. So finally we let him take his equivalency test and pulled him out of the system. This was the middle of his junior year. At that time he was 16. One of our big worries was that he couldn't write...So we had him write a paper for us every day. He did it! and he had one of them published by a University sponsored publication, and later he submitted one for a college course and got an A. It turned out that he was so UNHAPPY in that environment that it was difficult for him to function. And our schools are supposed to be some of the "best in the state" BUT Good schools aren't necessarily good for every one's situation.
I suspect your D may be also a little depressed and self-medicating. Have you had her AD meds checked lately? There may be a home schooling support group in your area. My area has a fantastic group of parents who home school. They do it mostly outside of the public school system...they call it "unschooling"...and this isn't crazy isolationist religious schooling, it is more along the lines of feeding the child's interests when they arise and supporting the kid in the best way possible so that the knowledge gained is genuine and relevant to their needs and desires at the time. Sort of a Summerhill approach...
Anyway, for us it worked best when I was on the scene. I would caution against the approach of giving her a pile of homework and standing over her until it is done...that will just get ugly. You may also find (as a lot of folks do...) that your D will have MORE free time since the learning is not surrounded by a class of 20-30 other students, discipline problems, school assemblies, recess, etc.
Good Luck Ellie SG
Survival Goddess "The most common way people give up their power is by thinking they don't have any." -Alice Walker