Chickassan
RIP 1975-2022
Quite possible, she just started getting the Sussex roundness though in the last month after hitting POL. Meyers sent me both of the tiny birds, that Faverolles was supposed to be a LF. 

That is small. But she looks more like a Sussex to me in body type than the first bird shown, and the egg you showed looked the right color for Sussex. So I think yours is a small Sussex and the bird from the original post is a spangled OEGB.