Opal is just going to stare at Charles with really big eyes. Felix will want to know if he'd like to go hunting, and... may ask about marriage matters. Fred is still going to hide her hobby from all other royals as long as possible.
Opal would feel much more comfortable with Rowan than she will with other princes and princesses, but I still don't know how much she'll talk to her. Felix will probably be rude to her, though he won't recognize it as such. And Fred wants to know if she still bakes?
Opal will have NO idea what to do with Gin. Felix will suspect he's a pickpocket, with his shifty looks. And Fred swears she smells gingerbread...