I am just curious as I am new to chickens and know nothing of genetics. But if the hen is single comb with no beard/muff is she destined to lay brown eggs or are they not directly linked??
It really depends on the genetics behind the EE... if you made yours with a true Ameraucana, you know you're getting a colored layer no matter what the comb looks like. If you made one with a single combed pure colored layer (like an Isbar or Cream Legbar), you'll get a colored layer that will most likely have a single comb. If you're getting an EE from a hatchery and don't know what the actual cross was the made your chick, you are kind of playing the colored egg lottery... seeing a pea comb would definitely up the odds that you see a colored egg, but it's not a lock.
Aren't genetics fascinating? I love all the possibilities!