In the episode Dora features, she is about to go into hibernation until spring. In order for this to happen, Pat has to deliver her a hibernation unit. Due to a mix up, the hibernation unit which is sent is too large. This then becomes a treehouse for the children while Dora gets a small hibernation unit Pat makes out of cardboard.
Lucy Selby is very fond of Dora and is with her when when preparing for hibernation.