Frankly speaking, this was a very foolish plan. Furthermore, once she lost her sanity, it was very likely that she would die before Sophia discovered her. Furthermore, Scarlet was very clear that even if she did not die, there was a 99.9% chance that Sophia would kill her to vent her anger. However, there was still the 0.01% chance that Sophia would pity her and let her go.
She felt that ever since she had formally become Sophia's disciple, she had always been respectful to her and always followed her advice. She also experienced genuine concern from her strict teacher. Although it seemed like this concern was born from selfish desire, since she had cared about Scarlet, there must have been some feelings involved.
Perhaps her Teacher would eventually let her go. Even if she could no longer train and would become disabled, it was not a big deal. As long as she was able to see him again, Scarlet was willing to do anything.