....is she getting bloom formula now? ... looks like too much N, not enough PK... Also, coco can't be run like regular true soil, it's a specialized medium that has a lot of specific do's and don't's, too many to list here,... coco is a soilless medium, and typically run more like hydro on some levels,.... Do some homework on coco and you'll see what I mean-

you water pH/hardness is a factor and must be known... hard water will mess with pH balance , especially at lower pH where coco needs to be (about 6.0)
... pH and ppm's of in going nute solutions and run-off needs to be known, min. of 15% run-off each time, and ppm less that 250ppm over what inputs are,,, that will vary depending ob what stage you're in, plant size, etc.,...mid to high hundreds at this stage typically....
Ca-Mg is a must, coco has some odd cation exchange capacity properties (CEC) relating to Ca and Mg, basically it binds them to itself and can keeep it from the roots untils a saturation level is reached, then it gives/takes like it should,....