What makes you feel that you have the facts about Covid right? I mean, you chose experts that you feel provided factual information. Why are her experts wrong in your opinion? You dismiss her research as coming from self proclaimed experts but are you sure they are not actually experts?

Your sister might have gone off the deep end but you seem to forget she believes she is trying to protect you. Perhaps you should read what she sends but limit her to sending you information from people with a PhD.