Read THE COMPETE BOA CONSTRICTOR by Vincent Russo. It's a great read and you will see mirrored advice there from Evenstar, Doolittle and Daybreaker. Your best course of action is to "slow grow" that female. She will still get huge. The largest boas are the oldest boas and the oldest boas are the boas that are not feed too frequently.
You and your snake will be much happier with an extremely lean, muscular body than an oversized, fat, pinhead body type.
BCC's are something special. I LOVE my BCI and would not change the fact that he is a BCI but you have, really what the "boa world" finds as the pinnacle snake.
Having said that, BCC's are also the species that allow fewer mistakes in regard to feeding and husbandry.
Best advice is to be patient and let your snake mature slowly. I just re-read the feeding and breeding schedules for these snakes in Russo's book and really can't stress enough how important the seasonal changes are.
It's not rocket science, however to have a long lived beautiful snake, it is the BEST advice to follow.
The hardest thing, and I know this because I want to have a nice big snake, is to use some restraint and grow your boa slowly.
This coming winter I will maybe feed my boa twice.