How far along is she? The leaves aren't doing too bad, especially for how developed those buds look. Fan leaves tend to yellow/fall off towards the end of the flowering stage as she uses less nitrogen, which is essential for lush, green leaf growth. The higher levels of phosphorus/potassium I would assume you're feeding her during this stage of her development help bud growth and may lead to the dying off of larger fan leaves. As long as there are enough green leaves to help her grow until she's ready to be harvested you should be fine!
