Bottom Leaves yellowing

I transplanted my 4 week old Gorilla Glue Auto… it was growing in FFOF w/ 30% perlite outdoors grown only… moved to 15 gal bucket mixed with FF Bush Dr. Coco Loco and 30% perlite… My bottom leaves are starting to yellow to the point where its white between the veins… pics included… please help it’s the only one I have left of this kind… and I don’t want it to die… :weary::weary::weary: Also I’m wondering if I should start LST and how?

Is she looking any better after a day?

I fed her…

I think she looks a lil better… :woman_shrugging:t2: I only put a cap full of FF Big Grow in a gallon and watered… plant is only 4 weeks old… Gorilla Glue Auto… she was just transplanted a few days ago into 25% Perlite/35%FFOF/40%FF Bush Dr. Coco Loco…