How do you react when she lunges toward another animal? You need to practice redirecting her attention toward you, focussing on you - make her stop, sit, down, whatever commands she knows. Don't start moving again until she is calm. Don't yell, just react and redirect her focus toward you, and stay calm. Enough repetitions, and she should get it. Being a Shepherd, she's smart, but that also means she will challenge your authority from time to time, so school yourself to be vigilant and consistent!