By pulling your daughter out of school for home schooling, you intuitively simplified the multiple demands of junior high. You are exposing her to a style of teaching and learning that is probably more connected and organized than the program she encountered in junior high. Medication may be helpful, and while your daughter is at home with you, you're in a great position to measure its effectiveness by observing her behavior -- particularly her ability to organize herself and her materials. You may feel more comfortable about medication if you get additional information from your pediatrician or a pediatric psychopharmacolgist.
If your daughter returns to school, she will benefit from a study skills program that will teach her how to be better organized and more efficient and effective as a learner. She will also benefit from having someone (like the person who diagnosed her as having ADHD) explain the condition to her in terms she can understand. Unless this happens, she may blame her inefficiency on herself, rather than her condition, and this can quickly erode self-esteem.
If your daughter returns to school, she should have a full evaluation by professionals in the special education program. She may need to have an individual educational plan (IEP) or a "504 Plan" written to insure that teachers and other specialists are providing the kind of modifications and programs she needs to achieve her full potential. She may need to be in smaller classes with teachers who are themselves very organized.