Dead Chicken - Next Steps

[cfree5]

I found a dead chicken tonight. I have been watching her as her comb was very pale, however she was running around and eating like everyone else.
I checked her for mites & live but found nothing. Also I have not seen any strange droppings & she was not egg bound.
Should I treat everyone for worms? All the other girls have bright red combs.
If so, with what? I have Waxine on hand.

 

[cfree5]

Not a great picture