I'm sorry to hear about your mom. As Bill implied, there is a way to fix it properly, but it probably will cost more than what you are considering. I'd assume it would be a gut job of the shower. It sounds like it's rotted out. But I think you are looking for a more cosmetic solution to get it out on the market and the future buyers can deal with the proper bathroom remodel if they want to. If that is the case, you might want to look into a couple of cheaper/temporary options such as: Refinishing your bathroom tile (essentially a company comes in and spray paints over your tile, here is an example) or covering your shower with a new liner

It CAN be done, but that doesn't mean it SHOULD be done. They do make covers that can go right over the present drain cover, and then you can tile right over its flange, and that's what holds it down. You first need to make sure there's no foreign material on the tile-- no soap scum, no body oils, no nothing. Then hit it with a sander to rough up the face of the tile, and use an unmodified thinset mixed with a liquid latex additive.

Thanks! The bathroom was just finished in April. Here's a link to my reveal on the bathrooms forum. I didn't list all of the details of fixtures and such but I guess I should have. Maybe I'll update it. The shower is in an alcove. My contractor made a custom pan so we could make it as large as possible. I think it is vinyl. I gained a few inches that way since I didn't have to use a standard size. The shower fixture is a Hansgrohe raindance shower pipe. I purchased on Amazon. My shower door was custom from a local shower door company. The floor tile is a 1"x2" Calacatta Gold marble herringbone from a local tile store. The subway and trim pieces are American Olean starting line white from Lowes. This was the only white subway I found that was a warm white instead of a bright white. I thought the color worked better with my floor. The grout is antique white on the floor and white on the walls. I haven't had a problem keeping it clean, but it is still fairly new. Here is a link that might be useful: Bath Reveal

I just finished a remodel and replaced the shower/tub combination with a great shower. I really couldn't tell you how much it cost because your costs would depend on the cost of labor in your area plus the materials and fixtures you choose. My showers were expensive because they were taken down to the studs. The rough plumbing including the drains had to be replaced. Both the floor and the walls had to be waterproofed. I also opted for relatively expensive finishes - Encore tiles and marble basket weave floors with Phyrich fixtures. I live in a jurisdiction which required multiple inspections before work could proceed including flood tests for the shower pan. The work was done by a licensed plumber and the tile work was done by a really experienced tile setter so labor was expensive. The end results of the intricate tile designs were done really well and so I have none of the horror stories that are rampant on this forum. I love the end result and I also am as sure as one can be that my new shower doesn't leak or have structural issues. Getting rid of the tub/shower combination was one of the best things I did in my new remodel as the end result is both highly functional and - at least in my opinion - beautiful.