Petulant

Petulant -insolent or rude in speech or behavior. 2. : characterized by temporary or capricious ill humor : peevish. — pet·u·lant·ly adverb.

 This is the word that best describes Amanda right now.  I'd hate to think that this was her permanent personality...I'd hate to think that she exhibited this demeanor to people other than family...but, I know this is who she is with us.