I dont follow mythical forum guide lines of 1500g anything under is voo doo.
A healthy feeding 1200g female i would breed, as they will gain and be well over 1600g by time ovulation happens. But since your girl is coming off a fasting period i wouldnt breed her so she can get her nutrition back.
Nothing like having a female fast, eat then breed and possibly slug out from lack of nutrition, or get eggs and they go bad.