I mean, there was plenty of hints that she wouldn’t be letting go of her grudge the whole time. The whole parallel to the demon was a big one, but she even said that she might not come back for the sword.
I only had the indication that she was the type who will only find peace once she gets her revenge
By that logic probably shouldn’t use a search engine and you should go to a library to look things up manually in a book, like I did.