I've only had one BCI, an unwanted (& very grouchy) yearling female that I took in many years back, and her growth seemed to take "forever" to me at the
time. I wondered if she'd ever exceed 6'...but by age 12, she was 7.5' & still growing.Careful what you wish for...but seriously, slow growth is normal
& healthier. Even as a big gal, I mostly fed her medium rats about every 3 weeks...she was NOT under-fed, & very healthy. Plus yours may be one whose
genetics run smaller...nothing wrong with that either. Yours is only 4...enjoy her for whoever & whatever she is. Don't over-feed, & don't worry, she'll grow.