Sugar leaves are not meant to support the whole plant during flowering, it seems to me as you got rid of 95% of fan leaves wich are in charge of getting most of the power to your bud's growth, now... i'm not judging, anything can happen, the leaves might have fallen on their own due to some sort of issues the plant had been thru. But if you get rid of fan leaves she can still hold it at first, but when the sugar leaves start to get covered in cristal, the deeper the layer of cristal the less light they are getting directly at them, like some top quality thc sun screen, and it covers up most of the plant besides of fan leaves, that's why you need those so much.
Now... i don't grow in coco but Plant seems healty overall just developing slow, there could be some possibility for overwatering considering the shape of the leave, but i don't grow in coco, but it sure as hell could be that too, if you are watering too often and the coco doesn't get a chance to dry out then its possible, weeds need their wet dry cycles (but then again i don't grow in coco, my dry cycle sometimes goes up to 6 days without watering in 50% soil. )
stay lit growmie. wish you the best and hope she grows out some killer tasting buds, and i hope those come caramelized to compensate the slightly lower yield.
(She appears to still have a while to go so she can still give some moderate yields, its not like she isn't growing at all)