I usually just put food and water where the hens can get to it, and leave it up to her if she wants to get off the eggs or not. Usually, she's in the barn where a bunch of hens were laying in one nest. The barn cats don't even try to mess with the peeps, they learn early that momma hen is very protective. It is not uncommon to see 3 week old chicks napping in the sun on a straw bale, and a barn cat napping on the other end of the bale. I do put a small waterer down and a feeder for the babies...
