mine battled the same thing, I took her to my schools contract athletic trainers...the issue was a short Achilles. Cut her a band, gave her a printout and walked her through a series of stretches to do daily. Kabam. Fixed! Not sure if it's the same issue but our trainer called it as soon as she watched her walk away from her. Her foot was twisting over rather than toeing over because the Achilles was too short to have her push her foot up and over so it slid around the side (if that makes any sense).