My mother is well, for 92. She is being evaluated by Sartori Memorial Hospital's psych ward. My only sister is her guardian. Can I help?

If you mean legally help, that would depend on why your sister is the guardian and what permissions she gives you. Otherwise, you may not be able to give direct help. You could try contacting the doctors and see where you get. Good luck with this. Much depends on your relationship with your sister.
Carol