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.

BBB link (although now that I know your vanity is 60", this will be too big) https://www.bedbathandbeyond.com/store/product/decorative-30-25-inch-x-42-25-inch-large-wall-mirror-in-silver/1041919644?skuId=41919644 Home Depot https://www.homedepot.com/p/Home-Decorators-Collection-24-35-in-W-x-35-35-in-L-Framed-Fog-Free-Wall-Mirror-in-Brushed-Nickel-81156/205577499 This might be a better size and it's fog free, which is nice.

hey, I made some comments to you on the DIY thread just now. Go back to your original inspiration at the beginning of this thread and find some sea glass/pale aqua/ I think a little blush color goes a long way. Use that at the end to add a little contrast. Maybe as trim on a simple shower curtain, soap/lotion dispensers, or in a little art to finalize it. Personally, I'm thinking using the color on your walls, and painting the vanity an off-white color. Pick a shade out of your counter top. Get some samples and paint several poster boards and see what looks best. Keep it simple! The pops and bling can be added at the end.

I always say "you're going to spend a lot of money remodeling this room, so you might as well do it right." Too often I see folks live with something that is poorly designed (like your sink arrangement) or awkward to use just because that's the way it is. So let's talk about what it would take to "do it right." I think you already know this, so let me confirm that the right-hand sink is too close to the wall. I'm sure somebody is always hitting their arm on that wall -- but we get used to living with situations like this as I mentioned -- or we think it's impossible or way too expensive to change. Moving that sink just a few inches away from the wall could make a huge difference. If you can stop the cabinet-maker, and give yourself permission to replan the vanity with a new sink arrangement, and new countertop, this will allow you to lay out the wall sconces in the right way and get rid of those horizontal strip lights above. (see photo below) You may need to include some additional plumbing and electrical work in your budget, and I realize these costs add up. If you do this, though, I think you will come to believe in time that this was the best decision you made -- and a wise investment -- since your bathroom will function better, feel better and look so much better. Enjoy. ps. If you're planning to strip the tile off that wing wall, I'd close up that recessed medicine cabinet area, too, then add a pullout cabinet with shelves like photos below to hold smaller items. It looks like you have sufficient space to add "his and hers" pullouts -- and the cabinetry could "float" above floor.