I think, they should be paying her a little something.
They are the parents, so she should be respecting that and doing what they wish.
Or, they can find a daycare or preschool for their kids.
They are getting "free" childcare.
BUT the parents are telling Grandma, that if they don't do what they say then they will put the children in Daycare and she won't see them.
That is really, obnoxious.
She is being put in a real, unpleasant spot.
But, if that's what the parents want, then just do it.
BUT if the parents are habitually just disrespectful and takes the Grandma for granted... then SHE can display her boundaries too. ie: don't threaten me with my being able to see my grandchildren or not.
I know MANY Grandparents who watch their grandchildren. And it is not easy. Taking care of kids, ALL day, is hard for the elderly. AND they have their own schedules of appointments too, which they need to tend to for their lives too. BUT since they babysit, they are home-bound and cannot have, their own life either, nor go to their appointments etc., because then the parents do not have anyone to watch their kids. And they take the Grandparent, for granted... and micromanage them. I know many Grandparents, that grumble about it. But they feel, STUCK in a corner... because the parents... just assume the Grandparent will always babysit their kids and if not, they put a guilt trip on them.
But also, some Grandparents... due to health or mobility problems or vision or hearing problems... they are, not in their prime for supervising active young kids or driving them around, and it can be... a safety issue. So that is why, the parents... may be confining the Grandparent in what they can or cannot do, with their kids. So that is the flip side to it, too.
Your friend, can just stop babysitting her grandchildren.
Or keep on doing it and with the parents telling her what to do.
BUT... the "threat" that the Grandparent cannot see their grandchildren unless they babysit them, is really, mean.
AND, since the parents are so specific on what they expect the Grandma to do with their children... THEN THE PARENTS SHOULD BE... buying the Grandma, entertainment/toys/puzzles/educational things/napping things/food, for the Grandma to have at her home... since she is watching them in her home, everyday. The PARENTS, should be providing this, to the Grandma.
They can't just demand that the Grandma do certain things with their kids, if the Grandma does not even have the resources for it.
The other point is:
She is the Grandma, not the parent.
BUT if the parents feel... she is too feeble or elderly to watch their kids safely... THEN THEY HAVE THE CHOICE, to find another "babysitter" for their kids. There will be a point in time, where Grandma may get too elderly, to watch 2 active young children. AND the parents, have to be wise enough, to know that. But not by holding it against her, and telling her she will not be able to see her Grandchildren.
THEY need to be wise parents... and recognize that Grandma may be too old or elderly or not active enough, to keep up with 2 young children.
If and when, my kids' Grandma watches my children, I DO expect her to do as I instructed. But I ALSO know that... my Mom is older now and gets tired and is a bit harder in hearing now... so I am careful as to what I expect of her. When with my kids.
*I*... am the parent and therefore, *I* have to ALSO gauge my Mom/their Grandma... per what she is capable of, or not.
That is a parent's, responsibility.
I do not demand something of my Mom... if I know she is not up to it nor capable of it, per her age/mobility/health concerns/hearing issues etc.
That is MY responsibility.