And ideas?

The single leaf looks like N toxicity, very dark green and yellowing edges. While the other pictures look like a N deficiency, the start of interveinal chlorosis. Either way the PH should be checked and corrected to the medium you’re using. If it’s not right you’re guessing at what’s wrong.

there's lockouts on lockouts, yeah... sure, feed it more )) the plant doesn't dead yet

Not cal, mag, NPK lockout or potassium, it is a zinc deficiency. Easily corrected with a dose or three of soluble trace mineral mix applied to the root zone.........do not foliar spray. Soluble trace mineral/trace element mixes should be available from any decent garden centre.

She needs a service mate get as many micros in the soil with a light feed of macros(NPK) and keep the pH the same.. does loom like a pH swing with something missing. I would give a potassium humate and aloevera solution and see what's happening. Somethings been off for a while by looks of it... need to try and spot problems a bit earlier, makes it easier to fix... Good luck

m0use don't know that K excess leads to Ca,Mg lockout... that is sad ='(

mouse mentioned potassium, and before seeing that, my first thought was potassium, so Ima go with that

Ca,Mg lockout