Your pH is way too low for soil growing at 5.6.........it should be between 6.2 and 6.8.
Highly acidic soils (5.6) will prevent nutrient availability, leading to the defects you are experiencing.
What nutrition is she getting? If your only giving her nutrients then give her some stimulants like seaweed/kelp. I can't recommend it enough.You only have to look at my roots to see the difference. Its used in all root,veg and some flower boosters.Canna have it in their rhizo and boost. It really is one of the things that you see working.
Hey Mr Nice Guy, you have a Manganese (Mn) deficiency- the symptom is yellowing between the veins with the development of small necrotic spots.
Solution - add cal mag. Keep ppm at 200.
Best of luck with your grow!!