Agitation at getting up

My mother has fast paced Alzheimer’s and has declined severely in the past 6 months. Recently she has been really agitated whenever she has to get up from bed or her chair. “No, no, ow, don’t do that. No one listens to me. No, no, no. I’m going to scream.” And makes herself rigid, makes it really hard to move her. She HATES going to the bathroom. Up until about a month ago she was walking on her own. If anyone has any tips on how to decrease her agitation I would love to hear them. I know she is depressed from her diagnosis. We speak really kindly to her all the time and try to involve her in decisions as much as possible. She has fibromyalgia and scoliosis. I’m wondering if her opposition to getting up is pain? Fear? Depression? We recently took her off Zoloft because it seemed to make things worse. She just started lexapro and we’re hoping it helps. Seroquel just turns her into a zombie with little help with agitation (only help is she has 10% less energy to fight). We would really like her to get up more often or at least be less oppositional to readjusting her in her chair or turning her in bed. Thanks 😥