I hope I haven’t given my child anxiety

My kid is 7 years old , today I was a bit emotional, I was conversatingvv bc with her about a bunch of stuff, like kids who get kidnapped, natural disasters, zombies lol . Then it kind of turned because I told her I love her sibling and if anything away to happen to me I would want her to always watch over her sibling, not to forget him because he has no family to rely on, my ex was very abusive towards my newborn so I do t want him nowhere near his family, I found out they are full of narc who condone the behavior, they have sex with each other it’s very weird and I’m going for full sole custody ..anyways my kid was crying we both were , I could tell she loves her little brother , she always watches him and plays with him , shares her food .. make sure he’s safe and warm . She doesn’t see him often because she lives with her dad for now. I just hope o don’t give her anxiety I told her everything is okay but idk what can happen tomorrow.. I have no family either so if I die they probably would put me on some island since I can’t afford to die,no one cares for me so I accepted that. My daughters dad has told me to stop telling her things like that but he doesn’t understand what I deal with plus he’s a narc himself and is abusive in other ways I just keep my distance from him, my daughter is very emotional and tells me everything, my mom was like that before she died, she always told me to be strong, I’ll always remember what she taught me even if it wasn’t much.. I want my daughter to always feel comfortable and informed.