Growling puppy during play.?

Just let her play she and all bully breeds, in my vast experience, are vocal when playing. Just be careful at the dog park they can dangerous because I see alot of unbalanced, untrained dogs at mine which is why I stopped going. If a dog starts a fight with your girl she will be blamed because of the extreme ignorance. But she is fine just love her and watch for either one to get aggressive.