CUTE cute cute!
if there are not very many chickens and there is a lot of room in the main coop, there would be nothing wrong with having them full run and giving everyone starter. Or doing something like starter for all for a week then adding another feeder with whatever feed you;ve been giving the adults. There will be no harm in this and actually be good if someone happens to be molting..
Separation will of course be fine if possible, just wanted you to know it is not absolutely required, same thing with the feed. It will again be no problem to have the mother hen eating only the starter. It will not harm her or other chickens in any way, it just has more protein than they need at the base minimum is all.
you can probably move her today... if you decide to wait until tomorrow, definitely move her and chicks even if she is sticking to the nest. She might have a bad fit but she will calm down once she has the chicks with her again.
edited to add I would like to know how many chicks too. if there are unhatched eggs, candle them... if some are close to hatching put them in incubator if you have one. Then slip them under her at night, so the chick has the whole night to bond with the hen and other chicks.
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