At that time everyone was scared and shocked, they didn't want to see anything happening to the young lady or the family. When one priest said that in order to purify the young lady, she needed to be burnt on the pyre so that in her next life she will be born with good karma.

If she got killed then the whole family will be safe and there will be no harm to them. In order to secure the safety of the clan and appease the royal family, the family dealt with the witch problem internally ...