My mom has the same aversion to showering, brushing teeth, changing clothes.

I did buy the same Clothing for her so she had the same clothes every day but they were clean to compensate for the lack of showers.

I also use the adult wash clothes..but heat them in the microwave for 15 seconds. Takes the edge off the cold.

It is exhausting...I have four hour breaks three days a week when a caregiver comes. Mom won’t let the caregiver shower her but she does engage in conversation. It is a great relief to have the respite care. It refreshes me and helps me find the courage to face another another day.
I hope this helps a bit