You are referring to the Greek Primordial Goddess of Night, correct?
If so, then a couple animals that represent Her are bats and owls.
Incense: Myrtle, Aloes and Camphor
Plants: Night-blooming flowers
For more here is a link:http://www.legionofpagans.com/gods--goddesses-witches--wizards/6701/nyxgoddess-of-the-night
Here is the most reliable source that I know of:
Nyx is the night itself,the personification of night not exactly a goddess.