I've heard of people breeding females at 1100 grams with no problems at all and still get a few healthy eggs, I'm actually trying to breed one of my females at just over 1100 grams. Of course that's the weight at the start of the breeding season. You usually feed the females heavy when starting out, sometimes 2-3 meals per week until they hit about 22 mm follicle size when they will go off of food (usually but not always). Then they will gain more weight as the follicles mature into eggs. So by the time they are ready to lay I'm sure they are well over 1500 grams.
I'm also breeding a pied female that started at 1500 grams and refused to eat and went on a fast at the start of the breeding season. My 1100 gram female is probably bigger than her now, I doubt my 1500 gram fasting female will go this year. Most people will tell you that 1500 grams and three years of age is the minimum, just one of those things repeated over and over through the years until it becomes a larger than life golden rule LOL.
I'd say your female will be ready as long as she eats regular meals every week or two and is still feeding at the start of your breeding season in September. If she starts fasting you could still pair her up, you may even see a few locks, but I doubt she will lay eggs if she isn't eating good at the start of the season.
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