I am heartbroken to hear this news. . Maddie was one of the best parts of the show for me; Meowth was terrific, and Team Rocket were (and are) my favourite characters. I liked them so much more back when Maddie and Rachael and Eric voiced them.
Not only was she a wonderful Meowth, she was terrific in ALL of the voices she did on the series. She seemed so cool and down to earth on the Q and A, too. And pretty! Magnificent lady all around.
May she rest in peace. I'm crushed to know she's really gone. .