Realistically, do you think that you've offered up such earth-shattering technical information?
At the end of the day, if her own coaches can't seem to help her, then my guess is that she's probably got shaping issues, probably turning too late, probably has the head sticking out, etc.
So, is there anything magical that I can tell this gymnast to fix her problems? The answer would be an emphatic "No."
For the gymnast, here's your "supplementary drill" - go back and work on swing 1/2 turns. Initiate the turn with your feet, keep the chest hollow, and look under the post arm. Be patient with this and eventually you'll be going back to handstand.