Ordinary Vicky went through the book. When she wanted to change the fate of others, someone had to make up for it, otherwise the world would collapse. This was Vicky's determination. She believed that everything would have a price, let alone changing 'history', so she watched silently, but after getting along with Professor Snape, she decided to save him. In the end, she had to save him.
(OOC warning) Original heroine × professor
Purpose: To warm people's hearts