Well today Suzie (the supposed ex-battery hen, who I’m thinking was probably not ex-battery) laid an egg!!!

And to top off the mystery... it’s an olive coloured egg

as seen in the middle of the photo below!
She has integrated into the flock really well... I think it helps that the rest of the flock are bantams so she hasn’t had to do much to hold her own. And she’s getting more tame, and doesn’t back away when I go to pet her now.
Does the coloured egg line up with anyone’s thoughts on breed? I’m definitely no expert where coloured eggs are concerned, but it was a lovely surprise!
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