What breed is my chicken?

Overall I have 11 chickens. 3 babies(Americana), 6 teens (Red Comet), and 2 adults(Red Comet). One of the Red Comet Teens (Muddle) we think is a mix. She is actually brown and she has the design on her back like an Americana might have. She is orange in some spots but barely and has any. She has a white belly, and dark brown sports all on her back mostly on her wings and none on her head. Her tail is pretty much the only part that is orange but only part of it is orange the rest of it is brown and white. She is a very pretty chicken and she is really nice to me and follows me around all the time. Thanks if you know what breed she is or if she's a mix. =)