What do I need to do in order to get Yuffie in my party once I have defeated her?

After defeating Yuffie a seconde screen will appear, in which will be your group, Yuffie, and a save point... avoid the save point, talk to Yuffie and select the correct réponses to her question, which are
"Not interested,"
"Petrified,"
"Wait a second,"
"That's right"
and "Let's hurry."