Well, The woman may not have been aware of the genetics of egg color. You may have a hen who lays beautiful blue eggs but a roo who has some green or brown genetics behind him, (most Ameracauna do, it's a work in progress). Many people also don't understand the differance between an EE and a "REAL" Ameracauna, (Many people also don't care about the nit picking) as it is purely about type and feather color and not about egg color. To most people a chicken that lays a blue or green (sometimes pink) eggs is an Ameracauna. So chanches are she wasn't lying, just not completely informed. I happen to like my OE and am working on my F2 and F3, but I also keep my blue egg layers seperate and I have a pen of mixed blue/green layers too. We enjoy having a "Rainbow" dozen
If you are looking for a " dalmatian (Not an Ameracauna color by the way) looking chickens that lay blue/green eggs" I would suggest you look at dmrippy's SBEL (Super Blue Egg Layer), they are an Ameracauna/EE x White Leghorn (So technically an EE) so they lay a alot of blue/green eggs. I have about 15 of them in my grow pen and I can hardly wait. I have some pure bred (Marans BBS BCM and Cuckoo, JG, W/BW Am,BBS Am, Cochins, Wyndotts, Welsumers), chickens that we seperate in the spring into breeding pens for hatching eggs, but usually they all just free range together anyway. I have customers who buy those to hatch out 15 dozen at a time, no telling what color eggs they get from that . but all good layers. We love them all.
Love your girl and accept that she lays an ugly egg, that makes you love her all the more.