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Xie Jingchen's discovery was indeed very meticulous.
After Yan Jinsu endured the first bout of intense heat without taking any medicine, the subsequent fevers indeed became shorter and shorter.
By the time the intervals between Yan Jinsu's fevers shortened and the fever became milder, Xie Jingchen finally put his mind at ease.
To repair the Soul Crystal, it certainly wasn't as simple as just absorbing the 'Purple Star Source' into the brain.
This time it was a fever, but fortunately Xie Jingchen observed carefully. If Yan Jinsu consistently refused to let her 'body' accept the essential dry heat, over time, it would be a 'destructive annihilation' harmful to her body.
After all, the dry heat is like a kind of bacteria; if your own immune system resists it, it becomes not a threat but a 'beneficial bacterium'.