About the pea combs and single combs. EEs typically have pea type combs, which are passed down from their Ameraucana ancestry, and look sort of flattish and fat and bumpy. But, since EEs are often crossed with other breeds, you will see some EEs with single type combs, which is the "classic" comb that most people are familiar with, that are thin and upright with finger-like projections. The pea comb is related to the gene for blue/green eggs, so if someone saw that Candy has a single comb and not a pea comb, she probably does not have the blue/green egg gene and you'll get lovely brown eggs from her. (This is not 100% as some people have reported a single combed hen laying blue eggs, but it's rare.)
When trying to sex a young EE, the development of the pea comb can be an indicator. Young males' combs will be more prominent and look like three distinct rows of peas or bumps (think peas lined up in a pod) by or before 6 weeks. A female will have only one row of bumps (peas-in-the-pod) down the center of the comb area. This "single row of peas" is different from a "single comb" which is a different type of comb altogether! Can be confusing, and folks forget that not everyone has the same amount of experience.