Cold-Blood
Tarantula Time!

First off, I have several questions.
1.) I have a Black Copper Maran named Nightshade that started laying eggs several months ago, laid 3 eggs within two weeks, and hasn't laid any eggs since. All our other chickens lay on a regular basis, even our bantams, and I'm wondering if it might just be an anomaly?
Photo below is Nightshade.
2.) Can a chicken hatch duck eggs? Is there any special things you have to do? (i.e. set a slightly damp paper towel under them before hatching.)
About:
I have
5 Wyandottes (1 silver {rooster} , 2 gold [1 is above rooster in pecking order], and 2 gold with grey/ blue feather fringes.)
1 Black Copper Maran
1 Easter egger ( Head hen, above rooster in pecking order)
1 Golden comet/red star/ golden sexlink- one of those.
1 Black Australop
1 Bantam ?Delaware? That was supposed to be a frizzle- she is the last of our OG chickens,
3 mixed breed (silkie x bantam Delaware)
1 unknown chicken as large and tall as a rooster, buff colored, has a medium sized crest and a single comb. (Above rooster in pecking order)
We also have 2 wild mallards that like to hang out with the chickens when they go near the pond (probably because the chickens scratch up all sorts of tastes stuff.
I have had chickens for 4 years.