What causes my mother with dementia to become agitated after being taken to the bathroom by her aides?

Thanks for your reply. This has been going on for more than a year. The bathrooms at her facility are extremely small. If I go in , there is no room for the aides. She uses a potty chair and they transfer her to it and then must quickly push the wheelchair out of the bathroom. Then do the reverse after. The care facility won't check her for a UTI because she has no fever or discolored urine. But she has experienced vasovagal syncope in the past. I have, on occasion , gone in with her when there is only one aide to take her. She cannot stand. It hasn't made any difference, she just accuses me of being "in on it". She is very paranoid and medications have not helped. They just increased it and she is not responding after over 2 weeks. The thing about not being able to identify pain that was previously mentioned may be something to explore further.