Wow, that's a hard one. I think it's a pretty good answer for a six year old, tbh, and I say this as someone who has never had to explain it to someone so young. ±800 years of violence and hatred, on both sides, is a lot to take in, so yeah, well done. I'm am sorta assuming, of course, that this answer, like most answers to kids, will change over time, but I think starting to try and explain why, during her mum's lifetime, so many people died over that bit of Ireland, might be a bit much. I mean, I have no conception of how you'd explain Omagh to a child, I can barely understand it as an adult. But, rightly or wrongly, this is part of their history.