Daizy's already shown she's a good mom - She'll look after her babies no matter what you do unless one becomes 'undesireable' and then it's yours to look after. I dunno why animals will single one out to reject, but they sure do look after the ones they see as viable don't they? I don't think you have to do much to care for the babies at this point except care for mom, and watch that she is not rejecting any.
It's hard to know when we're helping and when we're interferring and when we're just nosy cause we're enamored. (Yes, I did have an experience with this in the very beginning of my ratlove. My girl was cool with me and her babies, and the dad (he was very helpful to her & the kids) tho I've heard its not always good to have dad in there..
I think we rely on generalities and safe-scenarios - which is good - but don't always leave room for individual personalites (which if safer if we can't be there but kind of unfair sometime to individuals).