M.T.
Unfortunately, you can't make her change her behavior with friends. Many kids are bossy, ADD or not. The thing that can change how she behaves is when other kids actually say to her, "You aren't being nice, I don't want to play anymore," or "You can't be so bossy," when they start declining her invitations to play. She will have to learn her own lesson here. She will stop doing it when there is a consequence, and the consequence is kids not playing with her anymore.
Screaming and tantrums is a behavioral thing - tantrums are best dealt with by isolating and ignoring.
It's possible that her school counselor/social worker could be of help, they often have groups that teach children about improving their social skills by role playing, small group work, etc in elementary schools. Good luck!