Your post is not clear on what charges were filed. You reference a "complaint," which is generally filed in misdemeanor and felony cases. If your wife was charged via a complaint, then she is likely to have been charged with Simple Assault. Since the "victim" in this case was a child, the DA may treat this case more harshly than an assault case between two adults. A conviction is likely to result in a probationary sentence, but there is a chance that jail time could be imposed. If your wife were only charged with summary offenses, such as Harassment and Disorderly Conduct, then the sentence is likely to just be a fine, with the maximum fine permitted by law of $300.00.
With regard to whether or not your wife has a good case to fight depends upon the precise facts. If there is a video that shows the incident, then there is an objective and neutral bit of evidence. You need to retain a lawyer that is a criminal defense lawyer that has experience in the county in which you reside. An attorney in that area will know the police officer and the DA, know their tendencies, and thereby be able to give you an idea of precisely what can and should be done with the case. In trying to locate a lawyer in your area, I recommend going to the Pennsylvania Association of Criminal Defense Lawyers (PACDL) website and using their attorney directory at http://www.pacdl.org/members-search.php
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