My silkie is sitting on eggs.. Need advice!
Read this thread about broody hens. http://www.backyardchickens.com/t/496101/broody-hen-thread
Read this one on candling and compare your eggs to the photos to determine how old the eggs are. http://www.backyardchickens.com/t/261876/chicks-are-here-egg-candling-pics-progression-though-incubation
Silkies are great for hatching eggs. If it's her first time you'll need to watch carefully for when they hatch to make sure she will be a good mother. If not, then you'll need to take the chicks from her and put them in a brooder.
Consider an outside heating pad brooder like this http://www.backyardchickens.com/t/956958/mama-heating-pad-in-the-brooder-picture-heavy-update if you can swing it.
I'm really sorry to hear that.
Many people advise to isolate a broody hen and her nest where she can be protected from others and also keep the eggs from being added to or stolen away. A quiet area with her own food and water and a small run where she can stretch will help things go better next time.
A hen that is broody has the hormonal urge to sit on a clutch of eggs until they hatch. The do not lay eggs during this time. They only leave the nest once a day to eat and poop.
If you want this to work, you need to separate your broody silkie, or both of them, in an area where the bigger chickens cannot get to them.
Once you make a safe place, you can put her/them in there and slip a new set of eggs under them.