Also; the first time Leia meets Rey they hug for a while without speaking. If it were just about Han dying wouldn’t she hug Chewbacca? Leia; being force sensitive, (you see her react to Hans death even though shes on another planet), may have felt it was her daughter, and had the mixed emotions of losing Han to Ben,…

My theory:

I’m thinking they didn’t know it was their daughter. Not Han at least, and maybe Leia just kinda knew.