Its acommon Problem.
Your Girl just cannibalised herself in Transistion to Flower
You may have missed the point of transisiton and the feeding was to low
Its no big Problem at all.....its the older leaves and they just will drop off
You may just be patient now and look at your feeding schedule and regulate it to more nitrogen ( not much more) and feed for the next 14 days every day... your Girl will come back and the yellowing will go back
I hae it often if i put my outdoor plants inside,,,, Because i tend to underfeed very often my Outdoors... so i have to
feed them more often from the point they move indoors
Dont worry everything is fine
She was just HUngry