Adopted hen only laid 1 egg since October

[cherrynberry]

Your hen might just be young and will start laying later on.

The bird in the OP looks old, not young.

 

[cherrynberry]

Are you positive @Lorraine A ?
Not all 'ameraucana' more likely an Easter Egger, lay blue/green eggs.
Here's how to check to see.....
https://www.backyardchickens.com/articles/who-is-laying-and-who-is-not-butt-check.73309/

I agree, 100% EE