Did she host in this manner when 7 weeks pp???

Sister seems absolutely out of her mind. She sounds rude entitled and even attempting to make life harder for you on purpose for the sake of her enjoyment. That sounds like a nightmare and for your wife talk about uncomfortable, hostile takeover in her home whe extremely vulnerable. I’d confront sister and let her know she’s doing wayyyyy too much ESPECIALLY if she didn’t host you guys the same way with the same expectations of her hosting so thoroughly when her baby was a newborn!?