My mother was placed in the facility and my brother is the POA supposedly but I have not seen any paperwork. I have her original POA pre-dementia. She revoked my POA just 2 weeks ago and doesn't even really remember. The facility won't give her back her revocation.
What I am getting at is I don't think the fact that in the past Mother stated she did not want to be put away should be what drives the decision in the current situation. You have personally cared for her full time, so you know what it takes. You also know her current health condition and what it would take for one person to do all the work of caring for her. If/when the revocation is set aside and you are once again the POA I hope you can objectively decide where Mother can get the best care in her current health condition.
And if for some reason you don't get the POA authority back, make the most of the situation you can't change, and continue to care for your mother where she is.
Whatever happens, may your strong love for your mother see you through.
I take it that you would like your mother to leave the facility she is in now, and your brother doesn't want that? If his POA status is valid and legal, then he is the person authorized to decide. If you don't think it is valid (because Mother wasn't competent when she changed it), you will need a lawyer to untangle that.
Have you discussed with your brother the issue of what is the best place for Mother to live? Do you know why he wants her where she is, and has he heard your concerns? Ultimately it it the POA's decision but I would hope that family members can at least share their perspectives. From other posts I've read on here, that is probably naive ...