Momma must have been the 1/2 German Shepard part. Perhaps she knew you were packing, and was trying to protect her pups.
NOT! Oh, that's OK, she won't hurt you
...How many times have you heard that from dog owners just before beloved pet springs for your throat.
I'm glad you got away unharmed.
Your distant neighbor should have known, and warned you that momma wasn't nice...Too many of us have our head in the sand regarding our pets.
Personally, I'm owned by a West Highland Terrier.