First thought was a shepherd x lab of some variety, but maybe something else in there to get that more pointed noise/triangular face.
Second though would be a ridgeback x of some sort, but would definitely need to be a cross with another mix.
I don't see bully breed, the eyes and face are all wrong and the tail is too "fluffy". The body shape has a bit of bully in it, but that could easily be from other breed combinations as well. Based on what you said about her personality - shepherd x lab seems the most fitting.