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.
Seraphina wears a black dress complementing her dark hair,Wikimedia dates this to 1810, but the waist and sleeves are more in keeping with 1825.
Keywords: Seraphina zu Leiningen, Leiningen family, German, long curly coiffure, jeweled headdress, vee neckline, pleated bodice, long upper puffed sleeves, waist band, natural waistline, order bows, necklace