I am not sure what she is - but she is adorable! I am only familiar with buff brahmas, and they have a grey body when they are young. Plus, brahmas have feathered feet, so, I wouldn't think so. Hopefully someone else will be able to through out some ideas!
After doing some googling, I think it is probably an EE. The guy at the feed store said the bottom is an Ameraucana but seems EE to me. The top one (the one in question) has a bit of the "chipmunk" coloring on it's back and like turtle said it has a serious beard going on, so I think it may also be EE. The feed store does indeed get their chicks from a hatchery so maybe light brahma isn't necessarily ruled out, but I'm leaning towards EE for now, I think. Any other input is certainly welcome!