I just count myself lucky that our family relationships weren’t like this. I cherish a picture of my late mother holding my DD in the chair next to my hospital bed the day after my Caesarean, a lovely smile on her face. They’d travelled 2 hours to visit me in the hospital during visiting time, and late DB travelled twice as far, but they didn’t stay, went home of their own volition and GP came back to stay a few days after the 3 of us had settled back in back home, we were delighted to see them and they were a wonderful help, did all the meals, tidying and cleaning, tea for visitors and Mum helped with the baby. Stayed for about 10 days including when DH went back to work after a week’s holiday (no paternal leave then). No clash of wills whatsoever. But no accounting for different family dynamics, or even cultural expectations, and it was of course well pre-Covid. I can just envisage the midwives encouraging this sort of message, there was an element of that even back in the day; make sure your DH does his bit, don’t run around after visitors while they enjoy cuddling your baby, all common sense.
We don’t yet have GC sadly, who knows if we ever will, not our business, but it wouldn’t surprise me if DD laid down these sort of ground rules if they have children, though I’d like to think she would communicate them a bit more thoughtfully.
But nearly all those of our friends who do seem to spend their lives working around DCs’ childcare needs, to the exclusion of their own needs. I might feel differently if we had GC, I guess. When our DD was small, I remember thinking that those with Mums nearby didn’t know they were born, not to mention the cost of childcare. As others have commented, I wonder if OP’s niece will have that sort of expectation later on?
In the meantime, I would definitely be inclined to be unavailable, I think, when “summoned” in 2 weeks, just to make a point! Petty? Moi? Sure!