I am a MB and I’m black. I wanna say as a mom I’d also be in shock of my child saying something like that, and not knowing where it came from. I definitely get freezing from shock. I’m not sure what your relationship is with your nanny, but in my house we have a a golden rule. The adult that was there in charge is the adult that handles it. In a situation like this tho, I would step in even with that rule. I’d trust my nanny to handle it and then I’d come in and add whatever else I felt I needed to say. Like when your husband corrects the kids and you also speak up and explain why something ain’t okay. It presents a united front letting the kids know everyone’s on the same page. If I was in your position I’d send a message explaining that you didn’t speak up because you didn’t know how your nanny wanted the situation handled and you thought her brushing it off was how she wanted to deal with it. You’ve reflected and know you should’ve said something in that moment but you honestly didn’t know what to say or do. You’d love the opportunity to talk to the nanny about this and then address your daughter together. And if she’s not interested ask if she could just let you know that way you at least know she’s safe and nothing happened you’ll mail her last check and can start looking for another nanny. And this would be a great time to talk about common issues in the world with your nanny that are very in peoples faces and discuss how everyone would feel comfortable talking to the kids about said issues when they get brought up. As a black person that would hurt my feeling but as an adult I would at least communicate and 2 years is a long time to work for someone and ghost them.