"OP's dd will be going to school at some point, presumably she is not a newborn, so really the OP is asking for 3 or 4 years of a one day per week commitment - it's not like this will go on for ever. I am genuinely surprised that people think this is a huge ask, especially in the light of all the things the OP's mum said about helping etc."
How many children does this woman have?
How many other grandchildren?
Asking for somebody to take on an unpaid job for 3-4 years is a massive ask.
Enormous.
It means she is not free to do what she needs to do for one weekday out if five, and she will not be free to take holidays.
This kind of selfish attitude to your parents' time can have massive knock-on effects on the relationships they maintain with their other children and grandchildren.
Helping out and taking on regular childcare are not the same thing. Not even close.
The former is a flexible arrangement, the latter a massive commitment that necessarily crowds out other commitments and spontaneity.
Why would anyone want to tie their parents up like that so they could work and keep all the money?
It's so greedy.
My mother has 3 children and 5 grandchildren (nearly 6). She helps us all out loads, but the deal is that she can't and won't do regular childcare because it ties her up too much.
My SIL has asked for a day of free childcare, which has put my mother in an awful position. She's doing it for now because she was put on the spot, but she feels taken advantage of and is looking for a way out of it.
4 other children are missing out because of DB and SIL's sense of entitlement to free childcare at my Mum's expense. It disgusts me that anyone could be so selfish to someone who does so much for them already.
My MIL has been tied up for years minding her daughter's children, which has meant she struggles to visit her son and his children. It's shit.