Ok so if the hen is sleeping in the box and is in there for a few days and not laying. She is broodie. Silkies tend to be among the group that go broodie the most. So once you know she is broodie, you can either let her sit on fertile eggs, which will take 21 days to hatch. Or you can get some day old chicks and put them under her at night, this method doesn't always work, it just depends on the hen. You can keep her where she is or put her in a "brooder" which is a pin where she can sit on her babies and they can grow up till mixing them it the main flock. It all depends on what you want. When she is sitting you will want to have food and water close at hand so she doesn't have to go far. I like to go out there and put the food and water infront of her so she can eat and drink while sitting and then i move it back to where it is in here brooder. If you have her in her own little brooder then you will want to take her out about ever day so she can do her business. Like has been stated make sure you mark if you dont split her since others will mostlikely add to her clutch. Also broodieness is a hormonal think so you cant force them and its on there schedule. You can candle them to see if anything is growing but dont do it to much cause you can damage them. They will sit on anything also, from fake eggs to golf balls. Hope this helps you.
Oh when the chicks hatch you will want to give them starter feed.
