Just as Hamberlynn wears chokers and 6 year old stretch pants to hide the illness, Chantal does the "HEE HEE" to hide her illness.Probably. There were some videos where she did it after she said something "funny" and its sorta understandable but then in some she does it out of nowhere. In one clip she is sitting there eating a potato chip and does it out of the blue..... I don't understand.
https://www.youtube.com/watch?v=jVqDBVFKjAk&feature=youtu.be&t=4m
at the 4 minute mark is what I am talking about.