Hi
@Natwillow
Maybe back away from showering for a while so your mother has nothing to build up resistance to, and you and the carers relax a little
Try an all over flannel wash instead, in a comfortable warm room, her bedroom so she can sit on her bed, possibly covering her with a towel or warm dressing gown so she's not sitting fully naked... even do a different body area each day rather than the whole body everyday
make sure the flannels and towels are comfortable on her skin and maybe use perfume free shower gel rather than soap, for my dad I used baby products
I also went slowly and talked him through what I was going to do so nothing was a shock... I also spoke soothingly to him all the time
Maybe play some quiet music and use a lavender spray... anything to help your mother be calm and settled so more likely to accept the situation