Seraphina Franziska zu Leiningen, born Gräfin Porcio by ? (Museum Grünstadt - Grünstadt, Rheinland-Pfalz Germany)
All I can find is she was married to Christian Ludwig zu Leiningen-Westerburg-Neuleiningen. I cannot identify where Porcio is - I found that name in Hungary and France. There are also numerous museums around Grünstadt.
From Wikimedia; spots throughout image removed with Photoshop by gogm.