My mother-in-law only has Social Security, no financial plan at all. Does anyone know if she would qualify?

Do you mean would she qualify for Medicaid if she needed it? The chances are good if she has no assets and is not penalized for expenditures in the past five years. She can began to apply at the local county office or online at www.medicaid.gov. Medicaid is administered by the states, so there is variation among the states in the max income a person can make.