I'm sure if Eilonwy and Wendy met, they would probably get to be good friends. She's a lady-in-waiting for Melody, so she may be a little formal at first, but once she gets loosened up a bit, she becomes a lot more fun.
@ Eilonwy: i really believe they would lol don't worry Wendy will be formal too, she's been educated like that, oh god they will get in so many little adventures XD