Seeking expert counseling is a sign of strength. A personal relationship with a caring professional is proven clinically effective.
Your and your daughter's situation seems very difficult for the both of you. The draconian UK Mental Health Act limits appeals (tribunerals) to every certain number of months. There does not seem to be much slack in the system, at least officially.
I assume that your daughter was sectioned because she was deemed a threat to herself or others (reading between the lines I might guess that she had suicide attempts because of uncontrolled bipolar
I suppose that you have tried for a Community Treatment Order and were turned down. If you had guardianship over her, would that make a difference?
The best person to talk to would be an attorney who specialises in these situations. I have no recommendations to make in that regard, as to whom.
You are probably already well-versed with the myriad of rules and regulations. If not, I recommend the following website; within it is a book that you can purchase that clarifieds all of the rules and regulations.
I wish I could be of more assistance. For now, keep up your daughter's spirits, and your own, by taking positive steps to obtain her release into a legitimate community treatment program.
Elliott Sewell, LPCC, NCC