I am going to send an email to the LPGA and ask that they check all 72 of Ryu's ball markings during the tournament.  I wonder if there is one where her placement was a fraction of a millimeter off the correct spot.
If the player, his/her opponent, the two caddies and the accompanying rules official don't see an infraction, then leave it alone.  The use of high-speed cameras in slow motion to determine infractions that the human eye cannot see and then penalizing players after the fact is ridiculous.