Back court Violation?

[jerrydon]

Games involve Texas high school girls rules:

Offensive team throws ball in at just inside their mid-court line. Offensive player A has both feet in her front court and jumps back accross the mid-court line catching the ball before landing with both feet in the back court.
The ruling on the play was that it was back court since she was established in the front court. I thought there was no back court vilolation on a throw in period.
Answers please!!