A common theory is that Nodjmet had several children with her first husband Piankh: Heqanefer, Heqamaat, Ankhefenmut, Faienmut (a female) and, the most famous of all, the future High Priest of Amun/Pharaoh  Pinedjem I. Nodjmet became Piankh’s most trusted confidant, and every time he had to fulfill his business in Nubia, the management of Thebes was left to her.

When around 1070 BCE Piankh died, Herihor was proposed as his successor; Nodjmet, however, managed to keep her prerogatives marrying this man. Later, Herihor claimed “kingship” – although only inside the borders of the Temple of Amun at Karnak – Nodjmet effectively became his “queen”: her name was inscribed inside a cartouche and later she bore titles such as Lady of the Two Lands and King’s Mother. Source Wiki

Whether the above is correct is disputed. See the Second Nodjmet debate.

See also the interesting article of Ad Thijs, Nodjmet A, Daughter of Amenhotep, Wife of Piankh and Mother of Herihor0

See Wikipedia Book of Carvens