Well we know Ahenaten died. And Meketaten, and Meriaten. And the other sisters were never mentioned agian. I only guess that something happened to them and they did not make it to adulthood.

The ancient Egyptian woman had a great deal of civil rights--except for the Royal Women! The were often used as bargaining tools--you can marry this princess, but you have to be on Egypt's "side". Isn't this being chattle?
The average Egyptian woman could own property, run a business, leave her estate to whomever she would please, marry when she wanted and not become an outcast by not marrying. Not so with the Royal Women. They could own property--but it had to be a gift from Pharaoh, and would revert to him at her death. Businesses were out of question for her. Any estate became Pharaoh's if he wanted it, and could only be left to her heirs if he said so. And marriage? Completely at the discretion of Pharaoh.

Most of the information comes from a paper that was published by J. Jackson in Fathom, an on-line library sponsered by the University of Chicago. The full text can be read at:
http://fathom.lib.uchicago.edu/1/777777190170/
Parts are taken from the translations of various ancient Egyptian text.
Also used were:
Tyldesley, Joyce. 1995. Daughters of Isis: Women of Ancient Egypt. Harmondsworth: Penguin.
Watterson, Barbara. 1991. Women in Ancient Egypt. Stroud: Alan Sutton

Very interesting. The same situation was laso quite similar in England until the last century. Poorer women had a lot more freedom than their richer counterparts, being able to work and live quite free lives compared to the harsh constraints of middle class and upper class society.