What Breed Is My Dog?

I rescued my sweet dog, Zena from a shelter about 4 years ago. When I adopted her, they knew she was a German Shepherd, but could not even begin to guess about what she's mixed with. She's probably about 5 years old now. She has a very slim build, and is only about 50 pounds. She is definitely a lot smaller than your typical shepherd. She was abused, so she is pretty scared around males. She pees every time a male she is not familiar with pets her. She also doesn't bark, which I think is also an outcome from her being abused. Other than that she is supper cuddly, loves kids and other dogs, and is full of energy. I've inserted pictures below. Any input is greatly appreciated. Thanks. :)