TB-- yup, she's tapped out that soil mate, and is starving more than a bit, more than one defc. hitting at this point,...yeah, see the purple main stem, not just the petioles? A clear sign of general "starvation"... yellow tops smack of S defc., and the interveinal yellowing top to bottom looks like long term Mg defc., with P and K defc.'s mixed in I think,...all these can make for muddied diagnostic waters! ...likely there's underlying micronutrient defc.'s as well, considering what all they do in association with the main nutrients,... you need to get a more conc. PK in there and either epsoms salts (MgSO4, 1 tsp/qt) or better yet, a good micronutrient supplement, like Earth Juice Microblast, which will have both the sulfates and micronute elements.. The PK issue is your call on using organic (slower), or even temporary synthetic
right-now fast sourcing,.. I'm familiar with this deal, my KindSoil plants tapped the soil out by early bloom, nearly fucked the whole blooming! I had to use powerful synthetic nutes at weaker dilutions to get high PK in there (I used FoxFarms Open Sesame and Cha-Ching, 1/4 str.; if you look them up, note the crazy N-P-K ratios on them) to get ahead of the defc.'s, then used GO Biobloom and Roots Organics HPK along with Mammoth P microbe inoculant ( a specialized P oriented formula, not the typical inoculant microbes) while tapering off the synthetics,... She's a damn nice plant, just hitting a nutritional wall, face-first now!