Looks like a Motley BCI to me, as well.

Boas can be voracious! As the above poster said, feed an appropriate sized item - not sure about the 10-15% rule. They aren't round snakes - they won't get fat like your BPs, so don't stuff them trying to get them there! They should stay a nice plump square shape - if you keep to the above schedule, she will flourish with you.