I hope the count works for you. The more she practices it and really focuses on it, the better. This could possibly be what she needs from a mental standpoint to help erase some tentativeness at the board.
As well as run-up and standing tuck jumps into a pit, I also incorporate a springboard once in a while (usually during indoor season when forced inside into our gymnasium) for take-off/flight mechanics. We can see the vertical component more so here when an athlete takes off and it allows them to better practice the full mechanics of the hang that we use….along with the landing.
Talk to you soon Coach.