Her Wikipedia article is here. She became deeply entangled in the religious strife rampant in the 1500s.
From pinterest.com/sarahputt/sca-outerwear/; print in lower center of floor removed with Photoshop. Also posted to the Early 1500s - 1470 to 1550 Album here.
This portrait should date to 1540 or maybe later, but the coiffure is late 1400s. The deeply pleated skirt has a German regional flavor.
Keywords: Dorothea af Danmark, Dorothea von Dänemark und Norwegen, Dorothea of Denmark, Kurfürsten Friedrich II. von der Pfalz, Oldenburg family, Wittelsbach family, Princess, Electress, braided coiffure, jeweled hat, jeweled hat, surcote, high collar, lining, partlet, high enclosing neckline, necklace, jeweled bodice, long puffed slashed virago sleeves, puffed cloth ornaments, flared contrasting cuffs, rings, natural waistline, close skirt