No it does not matter, the state of MD will recognize the out of state DUI and can still charge it as a third offense in MD. Although, her attorney will try to negotiate for the new DUI to be charged as a second offense and sometimes the prosecutor will agree as part of a plea bargain, but you can contact the DA and inform them of her history and ask them to consider not making such a deal and you would do so by sending it in writing to the DA's office and also calling the DA and speaking to the DA handling the case, but it is ultimately their discretion.
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