Veg or flower if flower what day?
Pretty much it's either topdress with organic amendments or use liquid nutes if your plant is using up your N too soon. Might also want to check your water pH as well perhaps your water pH is too high and locking out some of the N so the plant can't get as much as it needs even though it's there. If you're in veg, you could also stick her in a 10 gallon
Some cheesequakes are heavy feeders, either you got one or you've got a pH issue. Pics would help could just be normal flower yellowing if you're in flower as well
if it's 2 months flower do nothing