You might also reach out to a group that specializes in advocating for the rights of people involved in the mental health system. One such group is the National Empowerment Center in Massachusetts. You can Google them to get their contact info. If they can't help they might be able to refer you to people who can.
MindFreedom is another possibility, they're based on the west coast but are national in their focus. Also the Disability Rights Education and Defense Fund--DREDF. Again, they might not be of direct assistance but might be able to refer you to someone or at least provide some basic info.
It would also be a good idea, as suggested in this thread, to find the documentation of the order that prohibits your contact. At the very least her appointed guardian should be willing to talk to you and give you some idea as to why contact is prohibited. She may reply that confidentiality issues prohibit her from saying anything, but it might be helpful for her to know that someone else, out in the world, is thinking about her ward and thus might be in a position to hold her accountable for any less than ethical behavior.
I hope this is helpful.
Best wishes to you and your daughter--
PS--there's another group that might be worth checking out--the Wildflower Alliance, based in western Massachusetts. Same deal--if you're not in their area they might know people nearer to you who can help.
Thucy.