Maybe root bound and a few other issues , phosphorus and magnesium deficiencies Sent from my SM-G975U using Tapatalk
Get her transplanted mate. Then quarter strength nutes at ph5.7- 5.9. Feed every day to run off. Wont be able to over water her once shes out the cup so make sure its always a good drenching to avoid getting hotspots in the pot
My first two grows I always got lazy about measuring nutrients and adjusting pH. I have been all over it this grow and last and come to find out it's probably the most important thing to do.