My mom is going back home soon after 3 months in rehab/SNF after a stroke. Her apartment building will modify the bathroom by installing a wheelchair-accessible shower. However, she has been getting sponge baths at the SNF since she can't stand up or transfer without a lift. I know there are shower wheelchairs, but it seems like it would be a big ordeal to get her showered, especially since she still needs the lift.
That is great that the management at your Mom's apartment is willing to remodel the bathroom. Is that something your Mom would need to pay to have done?
Maybe sponge baths would work just as fine since she is already use to those type of baths. As for washing one's hair, one can purchase dry shampoo or dry shampoo caps.
When the shower isn't a good option, we do a sponge bath with her sitting on the bedside commode. Take the bucket off and you have access to all important parts ;-)