I understand what you mean but she really shouldn't have to move. It's her home and the upheaval for her daughter at such an important stage in her education is also a factor.
Making a new start elsewhere isn't as easy as it sounds, making a new home, making new friends and enrolling in a new school.
I wouldn't move if it was me, i would never give these cowards the satisfaction. They didn't even have the balls to confront her face to face, the best they could do was smash some windows during the night.
Her son carried out the crime, she called the police and gave them the evidence used to convict him. She has nothing to be ashamed of.