I have rental property that my mother lives in rent free. Can I claim her as a dependent since, if I charged her rent, I pay for more than 50% of her living expenses?

The property was bought to be used as rental property. Before we could use it as rental property, my mother moved into it. She lives there rent-free. The property does not have a mortgage. My mother is a US citizen, her only income is Social Security, and she does not file a tax return. If I charged her rent, I would be paying for more than 50% of her annual living expenses. Can I claim her as a deduction?