Gyomei has always warned the Tsuguko he trains not to do too much and overtax youre body. But she never listened and did all the tasks with effort, which became more and more so. Now Gyomei also had to train other demon slayers (in hashira training ark) and so he helped them with their training while you could continue on your own, but you didn't react to your body, which was just extremely exhausted and so you just passed out while training with other slayers you were unconscious and no longer moving. One of the slayers told Gyomei, who was immediately shocked and worried and rushed to you as quickly as possible.