I probably wouldn't have said anything while the other kids were there except, "Yes, she will." If I felt it had made some impression on my kid I might talk to her later.
I have ample evidence among my dh's family that you can actually do these things in any order you like (even if you are only 14) so I couldn't say, "That's the only way...". But I do give reasons why I think its the preferred way.