Unless she's in the sun I doubt she's overheating.
If they're scattered about the cage, carefully gather them and put them in her nest. Offer bits of shredded toilet paper for her to make a nest with. I also highly recommend you take a cottage cheese/butter/sour cream plastic container, cut a door into the side (without cutting into the 'lip' that holds the lid on!, and let her use that as her 'hide'. They feel much more secure this way. For now, just put the babies in the nest she made, but once the babies are older make a new hide and place it in her cage for her to use if she wants.
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NMGA miniature meat goats, Silver Fox and NZW Rabbits, Muscovy ducks, several breeds of chickens, fancy mice and rats in Michigan