Each plant is different and some will respond completely differently to the same treatment as their sisters... It looks like this lady needs just a tad bit more nitrogen and I would suggest you add Tiger Bloom to her feed (the others might like this as well...). Big Bloom has NO nitrogen but you don't want to go back to Grow Big because that's got far too much for the flowering stage. Tiger Bloom has a small amount of nitrogen and I'm pretty certain she will respond nicely. It is now a staple of MY feeding regime... That being said, I will tell you I had a grow of three plants, same strain, where one of them was steadfastly lime green throughout her life no matter WHAT I did for her... didn't affect her harvest at all - in fact, she was the best producer - but still try to get your lady back in line with the others...
The only other thing I will mention here is that your feeding all of them a little lightly... By week 4 (from germination), I'm feeding my grows with 6tsp Big Bloom and .5 to 1 tsp Grow Big (depending on how they're handling the nitrogen)... Week 5, I'm still feeding 6 tsp Big Bloom but cut out the Grow Big and add 1 tsp Tiger Bloom... Week 6 through harvest I feed 6tsp Big Bloom and 2-3 tsp Tiger Bloom. I also add 1tsp CalMag but only once a week and then only if they need it.
Good luck!