Dear Ensapa,
I think you have confused the yogini/dakini Sukhasiddhi with White Vajrayogini. In some books, White Vajrayogini is also known as Sukhasiddhi but she's more commonly know as Kachod Karmo or White Vajrayogini. White Vajrayogini is actually a specialty of the Shangpa Kagyu tradition and not the Gelug tradition, of which the lineage of female yoginis of Niguma and Sukhasiddhi was derived from.