Do you have brothers and/or sisters? What do they think of the idea? Seems the big question is, is this the best fit for elder care for your mom and your family? Considering the different possible turns an elderly persons health and mobility can take?

Then, what do do with the house when she can’t use it, either because of health issues, or death?

If those things project out o.k. and she wants to do it, it makes her happy, why not?