The Heaven Sealing Lock formed out of the Icy Silkworm had already frozen her meridians into ice. Just the very attempt to move her zhenqi would cause unbearable pain to engulf her body, causing strength to swiftly recede from her body. If she forcefully continued after that, her meridians would swiftly collapse, and the damage that she sustained would really be irrecoverable. In the worst-case scenario, she might even lose her life.
The reason You Ruoxin had planted something so vile in Zhao Ya in the first place was to strip her of her choices. As long as she refused to succumb and awaken her unique constitution, she would be constantly placed in a state of suffering. On the other hand, as long as she chose to submit, she would be able to become a top expert in an instant!
Which the better option was, surely any rational person would be able to tell.