In Schutzhund:
Bitches In Season - bitches may participate in all events with the exception of the AD, however they must be kept apart from the rest of the applicants. They are shown according to schedule in phase "A" (Tracking); in all other phases they are shown as the last competitors at the end of the trial. If there are several in-season entered, they are to draw for positions among themselves, starting at the end of the trial.
I personally would not trial my bitch at that time....she is definitely not herself performance wise during this time.