She shouldn't be asked to! The lady's granddaughter should take care of her own baby, for heaven's sake.
I don't think the reference is to a full day of care, but rather that with the ankle bracelet, granny is now prevented from going to the great-grandkids house. It's a lot less hassle for granny to go see the child, than to drag the child across town, but that's now what's going to have to happen.
And that's possible only if this isn't considered a crime that limit's granny's access to kids altogether. Strange things are happening in England.