Thundar would stay around in a library. She’d also would continue to work on her spell, in hopes that it’ll come in handy. She won’t look for anybody, even though she feels extremely lonely(she’d never admit it though).
And when somebody found her, no matter who it was, she’d break down crying as she clung to them. Because hell, she’s missed everybody. And to see one of them again would just be amazing to her.