How does Helen respond to her punishment? She blames herself for her punishment.
Helen Burns is responding to Jane's story about Mrs. ... Jane is describing how Helen Burns helped her when Jane was punished and humiliated by Mr. Brocklehurst at Lowood. Helen takes a risk and reaches out to Jane with a friendly glance during Jane's humiliation, giving Jane strength and hope in that difficult moment.
If im on the right track then a way to right it with dashes would be: Sacrificing her was a mistake-a mistake that could have been avoided. but i may not have understood the question??