Dont push feeding with boas. Just cause they are a heavier bodied snake dont mean they require large meals leaving bulges in their stomachs. This is the main problem with beginner boa owners.
Overfeeding is VERY easy to do with Boas. You wont know it till its too late and you end up with the pinhead effect. Feed smaller meals weekly and slowly, average adult bci boa needs nothing larger than large to xl rat weekly.
Also being BCI dont expect her to surpass 7ft.