Splayed leg is when they can't keep in underneath them and they basically have it out on the side. https://images.app.goo.gl/oiaxjZv2HGnAYpqs6 Here is a good example image.
Have you asked nicalandia about it?
I know that you have found a way to do it, but do you have anything to prove it? What would cause it, genetically speaking??
But genetically, there wouldn't be a difference between a female sex and male sex, without a specific cross. I don't see how its possible no matter how long you have been doing it.
She is a purebred OEGB, correct?
I don't have much experience sexing from down color, but just for the heck of it, I'm going with female. Just a random hit in the dark, a fun guess, basically.