My beautiful Annabelle, but what is she?

[Starrponies]

I adopted Annabelle as a backyard solo chicken that wouldn't lay eggs. I added her into my flock in a separate cage by herself and that first night she layed me the most beautiful dark brown chocolate egg. She is a laying machine and so sweet! But what is she? The lady didn't know anything other than she was cute and a rare breed she picked at the store I'm at stumped I've asked Google lens and it says she's a lamona (spelling?) but they lay white eggs? I'm stumped she's in with a bbs orpington rooster, I'm curious what might come out

 

[TOMTE]

Mix? White Rock or Rhode Island White?

 

[BigBlueHen53]

Post pic of egg?

 

[Starrponies]

Post pic of egg?

Added it

 

[BigBlueHen53]

Sure looks like a Marans egg but no idea what your bird is. Fun mystery!

 

[TOMTE]

That is a beautiful egg! I was thinking a lighter brown!

 

[DemeterAD9]

I know there are white marans that lay dark brown but their feet and legs should also be white. Looks more like a white plymouth rock who just happens to lay dark brown eggs? Lucky you!

 

[JedJackson]

The closest match to a pure breed is white Plymouth rock, but I suspect she's some kind of hatchery hybrid, of which there are dozens.

 

[Starrponies]

Her chick hatches this Thursday. I'm so excited!