In short, no. However, she does need to have an attorney represent her at the hearing and be ready to pay the fine for this offense on her behalf. If she is over the age of 18, she will need to have a power of attorney signed (she can have it emailed to her, sign it, have it notarized, scan and email back - mail the original).
So, while she does need to have an attorney be there in her absence, she does not have to be there in person. If you guys just want to pay the fine, then you should contact the court clerk. Some judges will allow the person cited to pay the fine and avoid going to court. Other judges want to make a larger deal out of this and require some form of court appearance (even if it means an attorney in her place).
As such, contact the court clerk in the court in which this issue is on file and see if you guys can just pay the fine and be done with it. That would alleviate the necessity for an attorney altogether as well.
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Best wishes going forward!