If she only went broody yesterday, its pretty early to give her eggs to hatch. I usually wait a week or so to be sure they're serious. I've had many a hen think she wanted to be broody but after a few days she decides it really isn't for her after all. One in particular will do that several times each year but after 5 years has never sat a full 21 days. Consequently I don't take her seriously when she thinks she's broody and she's never been given eggs to hatch. If I have a hen who thinks she's broody, I wait AT LEAST a week before giving her egg to hatch..... she has been broody since yesterday....