How does selling a home affect nursing home charges and medicare, etc?

My elderly mother is in a nusing home. She was told that if she sells her home she will have to pay with her own money to keep living in the nursing home. Is there some legal way for her to get rid of the house and not have to pay to stay. I've heard that she could sign over the house to one of us or all of us. Is this true? Or are there any alternatives?

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