Amelia would probably be delighted to meet Susan. She seems like a properly bred woman who knows how to properly manage children. Her own son was a handful, and she respects anyone willing to handle an entire roomful. Not to mention she knows how to dress.
River. Hmmmm. That could be interesting. Discussions of time and space. She might even be inclined to actually have a friend.
Flagg. Oh boy. Being a sorcerer, he may be very interested in her being a "little bit" immortal.
I have no idea with Az. I'm sure we can come up with something! :D