Your little Cornish, sounds like my little momma. Hang on to her, she is worth her weight in gold!
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I have a Dark Cornish hen that will adopt whatever you give her -broody or not! She steals chicks from other hens too. I gave her 7 Silkies I bought on craigslist and she raised them to maturity. She's now raising 3 chicks from eggs that another hen gave up on and quit the nest. I have another hen raising a single chick and the Cornish always tries to steal that other chick too. In the past I've had excellent luck giving chicks to broodies. I've put them right under the hens in the middle of the day - no hiding or sneaking them in at night - but if you really wanted to be sure, I'd sneak them in at night when it's totally dark.
Of course I have a rooster that practically adopts babies too. He feeds them and protects them, from the first day I put them in there with a hen.