Is it a phase?

Um, no one told me the 18 month mark was the beginning of the terrible two's? Has anyone else's kids done this? Arden has begun a transformation over the last two weeks, and while I still adore and love her to pieces, what the crap? She throws little tantrums, she tells me "no!" to everything, she wakes up at all hours of the morning (6:30 one day, 5:30 the next ahhhh!) and won't go back to sleep, she's all the sudden picky about food and won't eat her favorite things or really anything healthy, she manipulates her way into getting cookies or candy instead of dinner, she yells at me or cries when I'm on the phone and can't help her, she eats crayons?, she freaks out about going to nursery and totally boycotts the whole thing, she fights with other kids about toys and has to have her way, um who in the heck is this kid? My sweet, innocent little doll is turning into a maniac!!! Help!

Exhibit A: Crayon eating and face painting

Exhibit B: Making a mess, then trying to avoid getting in trouble by being cute.
Exhibit C: "Hiding" when she gets in trouble.