Khamernebti II detail of the group statue found at Giza.
Source: Ziegler e.a., L'art égyptien, pp. 226-227.
Khamernebti II was a daughter of Khefren and her name-sake, Khamernebti I. She married her brother Mykerinos whom she bore at least one son, Khunre.
She was probably considered Mykerinos' primary queen, as she is represented with him on a pair statue that was found in the Valley Temple connected to his pyramid complex.
In this statue, she is shown holding her arm lovingly around Mykerinos' back. The fact that she is the same height as the king, is a clear sign of her status and importance.
She was perhaps buried in the eastern of the three queen's pyramids to the south of Mykerinos' pyramid.
Excavation photo of the group statue of Mykerinos and Khamernebti II.
Source: Egyptian Antiquities on Facebook