Just because she is off to a slow start doesn't mean she won't become a voracious eater. I've had my BP for nearly three years and he's always been a fairly picky eater so he was a slow grower. The speed of their growth when they're young all depends on how consistently they feed. Basically what I'm saying is theres no way of telling right now whether you'll have a fast or slow grower. Also, as others I'm sure will suggest, make sure husbandry is spot on (I think they're a bit more forgiving than people suggest but I don't have anywhere close to other experience) . BPs are known to go off feed if the husbandry is off which is why I ditched aquariums for an AP T-8.
A lot of people go on a 10-15% body weight rule when it comes to feeding. That means the prey being fed is 10-15% of the snakes body weight. I did this for a little while but then started to eyeball it. Since I feed live, I can usually pick out the rat I want to purchase even though I don't necessarily know the weight. Largest part of her girth is a safe bet, especially if yours takes F/T. Since mine is established, I like to feed a larger meal once every 2-4 weeks and have had no issues. (Don't do this with your baby) Welcome to the forum! Everyone on here is awesome and has helped me a ton since I started on this reptile journey.
P.S. Don't go off averages you see on the internet. Every snake is different and will grow at their own rate. To some my 1,100 BP may seem small for a three year old but to others he's the perfect weight. Body composition is the most important factor.
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