I had the exact same problem. I picked out the vanity I wanted but did not think about the fact that it wasn't made to sit flush against the wall. I spent a month looking for something else, but in the end we decided to go with something shorter and have it not be against the wall. But we were going from 72" to 60" which is probably not workable in your mom's situation. I did find a lot of vanities that did have flat sides and could work in a corner, if you are willing to have the countertop fabricated. They just need to not have any trim detail on the top or bottom like the one you picked out does. I would just look at the ones without the pre-made tops. Because the pre-made top will still leave you with a slight gap because of the countertop overhang. This is an example: Avanity Modero which is sold everywhere, not just at Lowe's. The cabinet we ended up buying is an Avanity Madison which won't work for you, but I assume it is of similar quality. We are pretty happy with it. The drawers and doors have soft close but I do feel like the glides in my Ikea kitchen drawers are better quality. It is very pretty and I wanted a stained wood so I am really happy with our choice. If I had been willing to go with a painted finish, I think we might have stuck with the 72" Modero.

Here's a good link to some aging in place building considerations: https://www.nahb.org/en/learn/designations/certified-aging-in-place-specialist/related-resources/aging-in-place-remodeling-checklist.aspx Non-slip options for flooring/tile, high rise toilet, grab bars for toilet area and in shower (don't forget one for when exiting-a shower door handle is not weight bearing), lever style handles and a hand-held shower sprayer come to mind as basic and essential from my work as a nurse in a senior living community. A 40 inch pathway seems tight to maneuver a rollator or wheelchair in a turn to access the toilet or the shower, but if either your designer or contractor has universal design experience, then perhaps they can make some suggestions about facilitating safe and easy movement in the space.

Peke someone had posted up in the comment a picture of silver mixed with gold . I kinda liked it. I think we will leave the way it is for now. I think gold faucets look kind of a little to much bling . That may be an idea to paint frame on big picture but I am sure as soon as stores reopen she will be buying new decor. Lol that pic was not bought for that room. It was just something in storage from the past. Other pics were the same I do like them though frames are a natural wood. She may keep them but she may not. I hate that everything is closed especially Home Goods !

If you're redoing the shower anyway (looks like tile and grout are degraded and may not be keeping moisture out of the wall), then a tub is pretty cheap, and you might be glad you replaced it rather than having to build your whole bathroom around the current shade of gray. Plus, it may look even worse once the rest of the room is fresh and new.