I can't get the pics to enlarge, so I can't see her comb well. What I can see reminds me of my pea comb x straight comb crosses. She does have an EE "look" to her, so one parent could be an EE or themselves an EE mix, and she's just been bred back to brown eggers enough to lose that blue gene and has either all brown or brown and white genes.
You could work on getting an EE or a pure Ameraucana rooster to breed to her, if you want. Pure Ameraucana are pure for the blue egg gene, so on matter who you breed them to the offspring should lay blue or green eggs, not brown. They're harder to find than EE, but if you put out a wanted ad you might be surprised who is breeding what in say a 30 mile radius from you.
Or, you could just go with hatchery EE chicks this fall or next spring. Not that I'm an enabler or anything
I sure wish roosters would wear a sign saying what egg color genetics they have. It would make various breeding projects so much easier!