Looks like your girl is doing great. During the first few weeks of flower your plant is growing at an extraordinary pace. When this happens, your new leaves are growing in so fast that they have not had adequate time to produce chlorophyll to turn green. So they just need a little more light/time to green up.
At this time you defiantly should be ramping your light up. By now you should be roughly 700PPFD
Hope this helps.