Interregnum queen
Encyclopedia
Some more recent research has other findings, but according to early twentieth century writers in 1932, an interregnum queen, is a Great Royal Wife
of a previous pharaoh who rules as a regent in the place of her heir-son, who has not yet reached the age to solely assume the role of pharaoh of Egypt. Officially the young heir-son is assumed to be king, de iure, making, in theory, his mother a co-regent.
In practice, the interregnum queen rules in the place of the young male heir as sole ruler, until the heir-son reaches an age when he could assume the duties of pharaoh alone. The term "Interregnum Queen" may have been the equivalent of the term "King's Mother".
Great Royal Wife
Great Royal Wife or Chief King's Wife is the term used to refer to the chief wife of the pharaoh of Ancient Egypt. While most Ancient Egyptians were monogamous, the pharaoh would have had other, lesser wives and concubines in addition to the Great Royal Wife...
of a previous pharaoh who rules as a regent in the place of her heir-son, who has not yet reached the age to solely assume the role of pharaoh of Egypt. Officially the young heir-son is assumed to be king, de iure, making, in theory, his mother a co-regent.
In practice, the interregnum queen rules in the place of the young male heir as sole ruler, until the heir-son reaches an age when he could assume the duties of pharaoh alone. The term "Interregnum Queen" may have been the equivalent of the term "King's Mother".