Is Lady Magenta dangerous?

While i was wandering through Avilion, i found some Wanteds...about Lady Magenta Bing, saying to approach with extreme caution and not to attempt to use magic against her.
My oh my, she is wanted for making green slime. I always had the feeling it was her causing the green water in Avilion and not the poor monsters.
Do we really need to fear Lady Magenta? The one waking up Avilion with the lovely sound of her voice "WAAAAKE UUUUP!!!!!! Please." The one bringing good people of Avilion to the monsters of the past? The one turning nice people into...somethings? I will pray for a good end.