Your question rephrased will still get the same answer.I've had females be at breeding weight by 1 year, by 2 years, and by 3 years. All perfectly healthy. All perfectly normal. There just isn't really a guideline like that.
Generally speaking, most females hit breeding size (which is up for interpretation itself) between 18 and 36 months. The road they take to get there is completely dependant on not only their husbsndry, but also their own individual metabolism.