If there was no arrest/prints taken it is doubtful it will show up on hr record except if she receives another fed. Summons, but it is an admission of guilt. There is no simple answer of what to do, the discussion would need much more info to advise.
Does the citation list a code section? If so, that would help us answer the questions you are asking.
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In my opinion, your friend must assume that paying the ticket will create a record that he or she was convicted of the offense. The "record" that is typically thought of is one's rap sheet or arrest record. One's record, however, is not limited to actual arrests or convictions for felonies or misdemeanors. Here, there is a court record and that court record shows a citation and if your friend simply pays the ticket your friend will have a record of conviction that may be accessible to employers and other interested persons in the future. For most people this type of record would probably not be a big deal, but having represented clients who are police officers, politicians, and professionals, I can tell you that right now is the best time for your friend to consult with a qualified lawyer to discuss the potential implications to him or her.