Every site on the net I've looked at says females go into first heat between 6-12 months old. Sugar will be a year old in 7 days and still no heat, might she not go into heat ever? I thought she wud have had it by now, it doesn't mean there's anything wrong with her does it?
She may have already had her first heat but she just had a "silent" heat meaning she displayed no major signs of being in heat. I know a lot of our mares used to be like that when we were into breeding horses.