So - no one has asked yet how old she is. I bred a 4-year old female that had barely reached 1200g with great success (it actually jump-started her growth and now she's 1900g one year after laying). If she's a late 2011 and that weight, you are probably asking too much of her. If she's a 2010, then she might not need to be 1500g. And as Zombie said, there's no reason you have to start breeding her on a certain date - just keep feeding her and keep her conditions normal until she gets where you want her to be.
As for cooling - I cool and have had zero problems with RI, and have had 100% fertility and hatch rates. It isn't necessary, but it isn't an instant vet visit, either.
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