Heidi is a non-smoker and her visits to the smoking room are motivated by her desire to tell everyone about the latest developments in her life, yet she takes very little interest in anyone else's, often having a smug, patronising air about her when she does interact in conversations with the others. However, she is desperate for friends and in episode ten we learn that her imaginary friend, Buttercup, was cruel to her and soon went off to be imaginary friends with another child. Heidi didn't have the imagination to invent another one. This early disappointment might explain why she is oblivious to the rudeness of others and why she is determined to have company at any cost.