Look at it from her point of view. As far as she's aware he abandoned her. Is it really that evil to want revenge on a parent that just one day decided to leave. (She's totally wrong, Illven did willingly leave, he was kidnapped again, but that's what she believes.)
But no ghost pokemon has cute charm. (And if they led eggs that would be spreading the shrooms)
But it's the afterlife. The shrooms are their own entity, and so would be judged seperatly.
Awesome avatar by Cuthalion
Spoiler: Old Avatars
Show
By Ceika, Ceika, Linklel (Except for one that appears to be lost to time)