Slow growing chick or bantam?

[mountainchickens]

Hi! We got fourteen chicks from Hoover's in August. They were born on the 13th I believe, ish. Two weeks later we got 3 more chicks. So the 3 chicks are 2 weeks younger than the 14 chicks.
One of the 14 chicks is tiny. We think she is a Cuckoo Marans and she came from either the Rare Breed or Colored Egg Layer assortment, but I've heard stories of hatcheries mixing up chicks She is now actually a little smaller and a tiny bit less feather growth than the 3 2-wk-younger chicks!! I will post a picture tomorrow morning when it gets light! In the meantime, does anyone know if she's just a very slow growing chick or a bantam? Even that wouldn't explain feather growth though...
Here is a picture from a few days ago. (The 12th to be precise) Thanks!

 

[chrissynemetz]

Can you take more pictures? Idk, it doesn't really look like a bantam to me.

 

[mountainchickens]

Can you take more pictures? Idk, it doesn't really look like a bantam to me.

Thanks! Yeah - I will take some more pictures tomorrow as soon as I can. Forgot to today... I'm not sure if she's a bantam but she sure is tiny compared to the rest. I will take a picture with both her and a sibling for comparison.