Tell her NO... your Husband did not... clear it with you.
Gee... your Husband... is real weak with her, huh?
Almost like a Mama's Boy...
Tell your SIL.... that YOUR MOM... is arriving. That's it.
YES TELL YOUR HUSBAND!
YOU should not have to go in the bathroom to feed baby. Geez.
YOU are the "Queen" of the house... NOT your SIL.
TELL YOUR Husband... to get a spine and a backbone.
Sorry.
TAKE the lead on this...
When I had BOTH my kids... I explicitly spelled out to my family and friends BEFORE I had my babies that ..." I DO NOT WANT VISITORS... (at the hospital or in my home)... NOR any drop-ins unannounced... until I.... am ready and I will say so.
AND that my phone voice-mail will be on and I do not plan on answering any phone calls."
And, my friends/family... respected that, because I said so... and they know me.
I do not... at my own birth or having new babies... want any... interference in that or what I do in my own home.. once I brought home my babies, nor while I stayed at the hospital.
Next: your Husband... REALLY has to get a grip on how much he lets his Sister... control him and you. Whoa. That is not good... for any marriage... and SIL probably gets great satisfaction from knowing.. her brother is on her leash... and she can control him. And that, she is, giving you a hard time. She I am sure... knows that.
all the best,
Susan