While in general by age 3 you get a good idea one how big an individual will be they do keep growing after that.
In your specific case that animal will keep growing and catch up eventually even if it takes a little longer, I have had small animals in the past that remain small due to poor feeding habit for the first 3 years of their life and than took of to be within normal range.
Now the question is how long will it take her to be up to breeding size someday? That is the million dollars question really.
I have a female that was maintenance fed when I purchased her, at a year she was barely 245 grams, I tried to change that by feeding her appropriately but her feeding became very sporadic, by age 4 she was barely 1100 grams so she was growing but very slowly and her feedings were still a hit and miss. I decided to breed her anyway even though I prefer to breed bigger females. My thoughts were that she might never get that big anyway and that breeding might trigger her metabolism. She gave me 6 good eggs and after laying she become a consistent feeder and is now within normal weight range and most importantly has a good body shape.
So it took 5 years to get there and a leap of faith that breeding would trigger something in her but eventually she got there.
Keep in mind that years ago people used to recommend 3 years of age as a minimum for breeding now we tend to recommend younger and smaller as years go by.
The bottom line is that yes she will get there, when no one knows.
My main concern would be to know if she is currently a good feeder.
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