I just got my copy of AOTC the illustrated companion by Marcus Hearn published by Ebury press and licensed to Lucas books. On page 55 it says:
Oh my God, they killed Yaddle. You bastards! We knew about yareal being assasinated but Yaddle's dead too now. I can't believe they killed her off. I really liked yaddle. Even if she was just used in the background it would have been cool to see her. Why Yaddle though and not Oppo goatboy Rancisis? Bloody idiots!!!!! I don't want to see the movie now. My appetite has been dulled since recieving this news, I go into an extended period of mourning and will adopt the Yaddle avatar out of respect for the dead...... *bows head in sombre silence*"Jedi council members Yaddle and Yareal Poof have died since the battle of Naboo"