Do you know the date of her first stamen hairs? That is when you start counting. Looks like week 2-3 to me. At 9-10 weeks you should have 80% of the stamen turned red/brown, frosted trichomes and an energetic, heady high with lower THC. By week 11-12 you will have all red/brown stamens, amber trichomes, with a more sedative, body high with high THC.
In my experience the stamen shift from clear, to green, to yellow, then orange in most sativa strains. Around week 4 they turn yellow. This is my lambs Bread at 4 weeks after yellowing for comparison.