Growling a lot when playing

I have a 4 month old pitbull/boxer, Athena will be 5 months next week. When she plays with my 8 month old pup, she growls and barks a lot and after a few minutes i separate her to make her calm down. She does great with people and other dogs I just wanna make sure she continues to not be aggressive. She is the first bully breed I've had and I been reading on way to train her and make sure she's well trained. I just wanted to see if there were any suggestions on training her and working more with her to help prevent some dog aggression. =)





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Growling a lot when playing