Mother Theresa's saintly work involved providing healthcare for the indigent and overlooked. Her criticisms involve withholding pain relief from those people for religious reasons.

That's not an unrelated "whataboutism?" It directly criticizes the action being praised.

(I'm not sure why the downvotes. Does this need substantiation? It was directly observed by a major physician, who wrote about it in The Lancet - https://www.thelancet.com/journals/lancet/article/PIIS0140-6...)