Well,in royal and princely terms she was very much a commoner with a dash of German noble blood just through her mother...here is her line from Schenk von Stauffenberg family,family of famous Claus,Count Schenk von Stauffenberg and Andrea's ex-girfriend Caroline,Countess Schenk von Stauffenberg:
Konrad Schenk von Stauffenberg,died in 1361=Adelheid von Ow
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Elisabeth Schenk von Stauffenberg
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Adelheid Megenzer von Felldorf
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Elisabeth von Pleiningen
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Erhard Faut gennant zum Stock,Rattherr in Studtgart,born in 1450
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Barbara Faut gennant zum Stock,lived from 1470-1514
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Elisabeth Stickel,died in 1531
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Margaretha Hom,died in 1606
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Christine Spam von Sparr
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Brigitte Stehlin aus Merklingen,died in 1598
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Brigitte Aubler,lived from 1584-1644
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Euphrosyne Leo,lived from 1614-1681
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Eufrosine Schübel,lived from 1640-1689
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Johann Christoph Lang,lived from 1673-1720
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Christine Euphrosine Lang,lived from 1707-1744
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Prof.Johann Christoph von Maier,lived from 1741-1821
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Gustav Maier,lived from 1793-1856
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Johann Christian Karl Maier,lived from 1837-1885
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Karl Maier,lived from 1863-1922
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Margaret Maier,born in 1899
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Grace Patricia Kelly,lived from 1929-1982=Prince Ranier III of Monaco,lived from 1923-1005
So,the von Stauffenbergs and all nobles that have descended from them could today count as Kelly relatives,no matter how distant they are.As we see Grace Patricia Kelly also descended from several other German noble families like von Pleiningen, von Münchingen, Spam von Sparr, von Felldorf, von Ow, von Rath, von Bettendorf , von Nippenburg, von Thierberg and von Salmedingen zu Erpfingen family...