Oh and if she is an actual she, does the single comb mean she may not lay green eggs? The info I'm reading is confusing and I wanted to ask. It seems that she needs to have a pea comb in order to lay green eggs? I'm sorry if this question is dumb. I'm new to all of this with information over load that is jumbling together.
Edited to add a link to her pic thread.
https://www.backyardchickens.com/t/891002/roo#post_13615680
Edited to add that the more I look at her, the more I realize the comb is more of a pea comb than a single comb.
There are a handful of single comb chickens that also lay blue eggs but more commonly they are pea combed. IE cream legbars have single straight combs and (SHOULD) lay blue eggs. If your chick was from a pea comb blue egg layer there is a strong possibility she will not lay blue(green) eggs because these two genes are relatively close to each other and are often inherited together.
Personally I breed pea combed blue egg and olive egg layers and immediately sell off any straight comb chicks as productive mutts because it is highly unlikely they will have the blue egg gene. Again that is only my stock I have no idea what kind of breeding program the person you got yours from is doing.