My 5 year old asked me what a soul is tonight

We had watched Kpop Demon Hunters, and after reading a nighttime story she asked me what a soul is, which the movie deals with a lot about but in a very abstract sense. It was a good conversation, we're not religious but aren't anti-religion so that aspect isn't a part of souls that I really know. I talked about how my soul is who I am, how I am, and that I think I'm a helping soul. She immediately said she is definitely a silly soul.

She's lost 1 grandparent and 3 great-grandparents in the last year, so heavy conversations seem to be a norm. Anyway, that's all. I'm just constantly surprised by the big questions that come out of nowhere.