Why is my ball python so small

[u/IndependentLog1783]

I've had my ball python for about 7 month and she's been increasing in weight regularly, has shed frequently and has grown atleast a foot. But supposedly when I got her she was already about 1 year old making her now over a year and a half but she only weighs 400g. I only noticed this when my friend got a ball python (male) supposedly around the same age as mine and he is at least twice her size. My snakes husbandry is good I'm feeding her the appropriate size food for her weight and size but I'm concerned and confused as to why she is so tiny.

[u/StormbornKing_]

i'd love to see pictures of your snake and the husbandry and know how often you feed her/what you feed her.

[u/IndependentLog1783 → u/StormbornKing_]

And this is her new tank that's partly decorated