I had almost the same problem with my spider, only he was too skinny instead of just small. He kept growing length-wise, but because he'd been underfed before I had him he was a skinny little noodle for a while. He's about a year and a half now, and still a bit underweight despite the fact that he eats and eats well. Sometimes those yuck conditions they come from can take a long time to recover from.
Every snake grows differently. I've heard/read stories about 1-2 year old pythons that were the size of hatchlings due to underfeeding, only to find new homes and begin to grow normally. I'm not sure if they ever reach full size potential, but as long as their healthy it's not a huge deal.
I'm not sure as to why she hasn't grown much at all. Maybe her body is still just recovering from stress and lost nutrients? I know their metabolisms are a lot slower than ours, so maybe that's why it's taking a while. Just a guess, but as long as she's eating and healthy (no parasites, tumors, etc. etc.) I wouldn't panic. Perhaps someone knows more on the subject. I hope she grows for you, even if just a little!![]()