N.G.
Hi J.,
I think before that talk can happen, you may want to give her the talk about what's on it's way soon...the menstrual talk. My daughter's 9th bday is in a month. I've touched on it, but plan on going into a little more detail with her.
The sex talk has to be very general, very vague at her age. She doesn't need to know everything, just remember she's still really young to know all that goes on. I would focus on the importance of how special it is--that it is something married people share together to show they love each other. I'd wait for more details until she asks. Good luck!