The beam on her smile is one of pure joy now, taking his offer and his selfless cause at face value because why else would he doing this for her?

"Thank you! I promise, one of these days-- I'll find a way to your kindness back." It was only right, she told herself. It isn't every day that she gets a chance to learn more about her condition, as it were, and learning something new or crucial to know.

His question is not met with any suspicion because why should she be looking at it like that? It is a reasonable thing to ask given her transient nature at times. Most ghosts shouldn't be traveling around like how she did but, then again, most ghosts don't linger for more than fifteen years if they're lucky enough. "I'm in Harrow most of the time. A coffee shop that used to be my old apartment building. I'm found in the Redbright Institute too. I work there as a security guard now!"

It kind of makes sense for someone like Clara to want to spend time with children and helping them out somehow. And in one of the few places that claim to be a safe haven for everyone, ghosts included, who is affiliated with it.