You are absolutely right, erect ears are the breed standard and flopped ears is a major fault.. Flopped ear shepherds can be more prone to ear infections.. I have researched this subject to death cause Nala is now eight months old has not had her ears stand on their own without ear forms or taping. .
Your pup looks like she has very good ear bases and also the fact they stood before, it really looks like they will stand again.
She is a great looking pup..