I suppose it's not impossible, but there is absolutely nothing about that dog that looks even remotely like a coyote to me. The sable coat which wild canids, in particular wolves and coyotes, often have, is also a common color in several breeds. Her build is too "solid" and her nose too broad to be a coyote mix IMO. The second and third pictures look almost exactly like a german shepherd. The only thing that seems "off" in those pictures is the pattern above her eyes. That kind of a pattern is not usually seen in sable GSDs (although I doubt it's impossible for it to show up in purebred GSD's) and is more typical of what you would see in a keeshond, elkhound, or maybe husky. Her muzzle seems very broad in the first picture, too broad for a GSD, in fact it almost looks swollen like she was stung in that first picture.