Daughter is a term of art in many fields.
To wit:
1.  " In nuclear physics, a decay product (also known as a daughter product, daughter isotope or daughter nuclide) is the remaining nuclide left over from radioacitve decay....--Wikipedia: "Decay Product"
2. "Cell division is the process by which a parent cell divides into two or more daughter cells. Cell division usually occurs as part of a larger cell cycle..."  --Wikipedia: "Cell division."
3.  "_Adactylidium_: The single male offspring mite mates with all the daughters when they are still in the mother. "--Wikipedia: Inbreeding."
4.  "A female-biased sex ratio of wolf pups conforms to Hiraiwa-Hasegawa’s hypothesis of the advantaged daughter, proposed for species in which mothers are able to influence the reproductive success of their daughters through transmission of rank."
--http://www.nrcresearchpress.com/doi/abs/10.1139/Z07-001#.Wf
“Daughter” is completely appropriate and is appreciated in this context.