Very beautiful dog and love the dark face. I’m not that experienced - but from what I’ve seen - she looks to be a working line GSD as opposed to an American show line. The American show lines have more angulation in their back when stacked. As for confirmation for a working line GSD, she looks just what I’d expect.
Here’s our 5 month old male for comparison. We don’t show and this is far from a perfect stack, but a picture my wife caught while playing fetch. His parents are both American show line GSD’s, which seems the primary difference is the more angled line when in a stack.