She looks great to me dude, nice work!
I don't see any yellowing on any leaves, honestly. Do you have a close-up of a yellowing leaf from this plant?
The smaller/younger leaves are a lighter/paler green than the bigger fan leaves, but that's perfectly normal in my experience. As they grow bigger they should become a little darker.
Older fan leaves have nutirents stored in them from vegetation, while newer leaves that grow during the 1st weeks of flowering don't store as much nutirents, since the plant is focusing more on developing budsites.
Hope this helps π
Do share a close-up photo of what worries you, though. I may be missing somethin...
Good luck and take care!