If you are the caretaker of someone on ssi you can be granted a small ssi payment as well, but it isn’t much. That is what happened when I quit to care for my husband. It was a couple hundred dollars a month. If she is eligible for Medicaid she might be allowed a visiting nurse or an aide so you can get a part-time job outside of home. Otherwise I suggest you figure out some way to work from home. I sell books online, one neighbor is a medical transcriptionist, another works for an insurance company, and yet another operates a “golf shop” out of his garage (and flirts with being cited for running a business in a residential zone).