She is the assumed daughter (she bears not the title) of Menkaure and a pressumed wife (again, titleless) of Userkaf, founder of the fifth dynasty and son of Neferhetepes (a daughter of Redjedef). She may even have been the chief wife of Shepseskaf for the brief time he reigned. But the only factual thing known about her is that both Sahure & Neferirkare were her sons and followed each other on the horus throne. I think the phrase "daughter of the god" should end any speculation on her being a kings daughter.
On both inscriptions, we come across this interesting
testimony:
mwt nswt bity, nswt bity, s3t ntr ddt ht nbt nfrt
irt.n.s
This could be taken to read:
"King of Upper
& Lower Egypt and Mother of the King of Upper & Lower Egypt. Daughter of
the God,
whose every command is done".
Egyptians had back then, what would've been hearlded as "great wit" today, but just now makes me want to slap one and say "write what you mean". This title could alternately be taken to mean:
"Mother of Two Kings of Upper & Lower Egypt,
Daughter of the god,
whose every wish is done for her. "
Or a third rendition to be read:
Ruler [or one who has the power of rule] of Upper & Lower Egypt,
Mother of the King of Upper & Lower Egypt, Daughter of the God,
whose
every good command is done for her.