Haa haa...yep...your reserach is correct, that is no Barred Rock...not even close. Maybe they meant Partridge Rock? But it's not a purebred Partridge Rock either (bottom half white) but may have some of that in it...or another partridge type bird.
It's not an Ameraucana either as it would have slate colored legs and a muff and beard as true Ameraucanas must have those.
It likely could be an EE (Easter Egger) which is an Ameraucana or Araucana "mutt"...any other breed on one side with Ameraucana or EE or Araucana on the other.
Chipmunk pattern as a chick is very typical of EE, however they usually have slate or green legs...but sometimes can have yellow.
Usually they have a beard or muff, but that isn't always true either as the other bird type may have come through rather than the Ameraucana or Araucana.
And they usually have a pea comb...which the top photo is pretty blurry in my monitor but looks like it could be a pea comb forming? But an EE can also have a single comb, so if it is single it wouldn't rule out EE either.
So it could be an EE....or simply a mutt mix of something else.
No matter what, it will be a pretty bird and hybrids are hardier and lay better and in my mind are often prettier (with all those genes creating unique patterns) than many purebreds.
Will it lay colored eggs? Well that depends upon a lot of genetics, but if it has a pea comb, and truly has EE blood, your chances are good if it is a hen...which right now it looks to be a pullet to me (small, pale yellow comb). Check the comb...supposedly if it has 3 distinct pea rows it could be a roo, but I've read that doesn't always make it so.
Lady of McCamley