In The Ghoul Next Door, Hissette was a gift from Deuce, to Cleo. Deuce said that Hissette was his mom's "first gray hair". Also for a good part of the book, she was turned to stone, and Cleo wore her around her right bicep. However, in Cleo's diary, and thus the doll universe, it says that she was sent from Egypt.
Monster Cross Hissette (whole)
Monster Cross Hissette (apart)
Monster Cross Hissette (boxed)
Hissette giving Cleo bunny ears in Cleo's Fearbook photo.