What is the yearly cost of the pool? Water, utilities, care? Have you considered having it demolished? To do that here (Arizona) costs about $5k depending on the situation. You may, depending on local and state laws, simply have several drainage holes drilled in it and filled in.
I strongly suggest not getting a condo. A condo may be not expensive to purchase, and does not have the (personal) responsibility for yardwork or upkeep, but has many many other problems, including people above, below, and on each side, possibly making lotsa noise.
Read the hoa site here to get an idea of a few of the problems faced by condo owners.
They do include high, and increasing yearly, dues, lack of maintenance of buildings and property, problems with plumbing from a neighboring unit damaging yours and the board resisting and denying any responsibility, owners not paying dues so there is no money for repairs, so her dues will go higher to make up for the lack, and many others.
google terms like condos and problems, hoa owner problems, problems with hoas, etc.
The purchase of many condos is pretty low. The cost of living in them is not necessarily, and condos are often harder to sell because of all the problems.
Though I would also suggest that she NOT buy into an hoa, with single family houses, a smaller single family house would, in my opinion, be much better for her. Hiring someone to do yardwork as needed for a smaller place may be do-able, and may not be needed every week or every month. If she needs to hire a housekeeper, maybe that will not be so much with a smaller place, either.
Maybe simply economizing on things will help.
Is she eligible for any local tax breaks due to age or marital status or health? Here, widowed and disabled get (small) tax breaks. If low income, some utility companies offer lower rates. Of course, these would be availale if she were in a smaller house, too.
A few last words on condo associations and home owner associations/any kind of association: they are CORPORATIONS. She would never own the property, would always have to follow rules set up by others, and pay them to police and enforce rules probably already paid for in her taxes. If she misses paying dues, they can lien the property and huge problems can follow, including foreclosure.
Look into it carefully.