It is rather difficult to answer your question with certainty. Your daughter may simply be acting up with a form of attention seeking behaviour because of your new baby and her sudden loss of your full attention. In fact this is the most likely reason for her behaviour, but I am concerned about her lack of response to you when you address her. This is the kind of behaviour symptom that can be of concern as it may suggest that she is showing some autism like behaviour. For this reason it would be best to ask your paediatrican to see her to be certain that she is just attention seeking and acting up and nothing else.
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