Well, I gave it a shot, and I couldn't find a listing for either Miz Cannon or Cannoncats.
Cannoncats showed up in the pedigrees kept by several breeders, though very far back, so perhaps she has closed down her breeding program? Or perhaps she can't be reached online?
Here are the pages where I found Cannoncats listed. Maybe if you contact those catteries the breeder can give you better contact information for Miz Cannon.http://hayaji.tripod.com/id76.htm
~ In a pedigree, the listing "GC Cannoncats Jazz Man, Seal Pt Siamese, CFA 0272-302281 V0787"http://www.geishagoll.com/memories.htm
~ In a memorial with a photo "GC Cannoncats Abelard of Geishagoll, 1982-83 CFA Best Seal point Siamese, MW Region second Best Siamese, One of our foundation males and sire of GC, RW Geishagoll Takara"http://www.siamesekitties.com/index.html
~ In the pedigrees, Cannoncats are listed in the great grandparents column for several of the cats