What are my leaves trying to tell me?

I’m in about the 3rd week of flowering... I think I may have used up the super soil as it’s been in the pot for awhile..These leaves are on the bottom of the stems..I’m getting better at diagnostics but still stumble at times..
These leaves simply dry up and fall off?..
Same for my clones.. except I up potted and my new growth seems to be coming along fine..leads me to think I need to feed this bestie gal..

How is your ph? Those red stems may be genetic, but may indicate a lockout or they are hungry, as you surmise.
Could be a calmag or potassium issue possibly.
Good luck.
FF