well, not that many girl pilots either...don't read anything into it...
if you are a girl and want to be an instructor...good luck, try to be good and safe
if you are a girl and want a girl instructor...good luck and I wish you the best
if you are a boy and want a girl instructor, see the above
if you ever see the movie about Pearl Harbor, "TORA TORA TORA" there is a scene in which a biplane is being used to instruct, a woman is the instructor to a boy learning to fly...she looks a bit like ethel mertz
I knew one girl instructor...she refused to land a tomahawk at the speeds listed in the POH...insisted to land about 15 knots faster (no wind)
She also wrote up a plane as having control problems...but the autopilot was engaged.
don't read anything into it...just my personal experience