What is the situation.
We are all after all human and suject to error. If he/she is wrong then you have 2 choices do what he/she says and when the error is found he/she will be humilitated by there own error. Witch you will probly be punished for. Or you could speak candid with her by using a safe word out side of Bdsm and discuss it.
Just a thought I can not give 100 percent advice becouse I do not know your situation.
Moby