Buds

Nitrogen down :) increase the Nitrogen in your feed. Alot of people tend to forget in the flower stage that nitrogen is still needed right the way up until the end. Nitrogen is a mobile nutrient within the plant this means its in constant use flying around the plant from top to bottom. If you take that source away she will begin to eat herself in search for nutrients hence the yellow leaves. In the final week this is what we are after but mis flower or late flower could impact your yield in a negative way. Though this is looking very mild so im sure you can just feed her abit of veg feed along side your PK and you should be fine :)