Hit and skip laws all over are being taken very seriously and that is rightfully so. While the rules in MD where this happened are likely very specific ( I do not practice in MD), as a general matter, leaving the scene after an accident is - at a minimum - frowned upon and is not a good practice. After the fact advise is like Monday morning quarterbacking, but I observe that in this instance your first phone call should have been to the police reporting the location of the parking lot, describing what happened and that to your knowledge there were no witnesses nor anyone hurt etc....
That said, you should not compound your mistakes by trying to fight this court situation without an attorney if you are charged.
You might find my Legal Guide helpful "Ethics: Yes I Need a Lawyer!"
http://www.attorneyqna.com/legal-guides/ugc/ethics-yes-i-need-a-lawyer
You might find my Legal Guide helpful "How to Choose A Lawyer For You."
http://www.attorneyqna.com/legal-guides/ugc/how-to-choose-a-lawyer-for-you
You might read my Legal Guide "Can An Attorney Really Help?"
http://www.attorneyqna.com/legal-guides/ugc/can-an-attorney-really-help
You might find my Legal Guide helpful " What Do I Tell My Lawyer?"
http://www.attorneyqna.com/legal-guides/ugc/what-do-i-tell-my-lawyer
You can miss defenses and say the wrong things if you are not represented by an advocate as your attorney.
Good luck to you.
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Maryland imposes criminal penalties for leaving the scene of an accident involving bodily injury. It is a criminal violation to leave the scene of an accident involving property damage but there is not a statute in Maryland that imposes a criminal penalty for leaving the scene of an accident that did not involve property damage or injury.