The most common is that they have a policy of just not dropping valid charges, feel that she needs to learn a lesson, feel that it is necessary for her to have a record just incase she does something in the future the second court will know that she had a first chance. There are countless reasons. I can truly understand your desire but many prosecutor don't view criminal court as a way to straighten a person out but rather to punish. This is why I made the suggestion that I did in my prior post.
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