I would say she is definitely most likely a American game over a OEG (which only have white legs), and a Modern game (which should be much taller, refer to feathersite for photos). But even then, she just seems like she could be a Indian red junglefowl as well, she looks identical to the two i purchased from Ideal 7-8 years ago.
Is the American game different than the Modern? Yes, in carriage, temperament, history, etc.
ETA: Black breasted red (BBR, BBred), black breasted, red black breasted (all depends how people word it, though black breasted red is the correct name and black breasted can refer to other colors as well), should all look like this. http://www.bantychicken.com/OEGBCA/variety/BBRcDougPierson1stCTb.jpg http://www.bantychicken.com/OEGBCA/variety/BBRp2HeatherHayes1stPTb.jpg
Birds are OEGB's, taken from http://www.bantychicken.com/cgi-bin/OEGBCA/index.cgi?action=showhtml&id=varitiemain. They're not my birds.