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Before I would jump to the anxiety conclusion, I would bring it up with her pediatrician. She may just be reacting in a way that is approprioate for her cognitive level of development, but seems strange. Anxiety typically occurs as a result of an incident that is emotionally stressful to the person... I would think that she is a bit too young to have a full blown anxiety disorder. The nail biting could be a transition from thumb sucking; the clenching jaw could have to do with the alignment of her teeth or some other dental related issue; and the uncontrollable crying could be a tantrum. Good Luck!