This is very challenging. I think you need a social worker to come to her home for an evaluation and try to talk her into getting help She's too sick to realize how sick she is. I'm so sorry, this must be very painful. Schizophrenia zaps their ability to understand reality. They don't want medication. But if they do not have it, they live like this. Adult services? Something that will force her into getting adequate medical care (primarily medication on a regular basis ). There is a treatment that is a shot that lasts for three months that is really a good tool with schizophrenia sufferers. No pills to take. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8490677/ But I'd escalate for help as she really needs it.