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You could be right, but here's more from the originating site where they try to argue otherwise: http://www.randominc.net/spinninglady/

it can't be true since when 2 or more people are looking it at the same time and place they will give you different answers... try it with your family ;)

Just be safe I check the interval of the switch, it happens roughly every 1min 15 secs. The way i notice it is to watch the direction that the tip of the ponytail is traveling.

No, downloaded the gif and separated the frames. It shows one complete rotation.

Good diagnosis, sorry; i wanted to upvote your comment; guess i haven't had enough coffee yet and hit the wrong button :(.