How can I find out if my sister has filed income taxes in the last several years?

My sister has been in and out of the hospital for the last several years. We have just stepped in to help her, How do we find out if she has filed income taxes for the last several years. She kept telling us everything was ok, and we never questioned further. Now she needs constant care and we need to find out... show more My sister has been in and out of the hospital for the last several years. We have just stepped in to help her, How do we find out if she has filed income taxes for the last several years. She kept telling us everything was ok, and we never questioned further. Now she needs constant care and we need to find out about her taxes.
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