Has she done it again? Iguanas are strange. Anything can set them off. Try to remember when it happened. Did you wear a new colored shirt? New cologne?. It is breeding season which is why I asked if you're sure it's a girl. Not heard of girls being territorial, but that might be it. Sorry I'm not much help. Mine have both been boys, and I'm always on edge waiting for them to act up like what yours did. Has not happened yet, but like I said, anything can set them off.