When is your fair? She does not look fat now, With heifers you just need to stay on top, adjusting her feed if she starts to bloom to soon, you can do that by cutting her feed ration in half and adding a filler to make up for it for a short time and then put her back on full feed again. You need to manage her for your end result, unlike as steer where you can push and back off at the end, you need to feed them so they peek just when you need her to. The Hi noon heifer feed might just be the ticket, as she gets closer and needs to put on fat you can change to a finisher or just adjust the fat content with stabilized rice bran the last few months.