She was tall and slender and had blue eyes.
Nacelle is relatively weak in the One Power. Her level of strength is described by "The Wheel of Time Companion" as 36(24) which is a quite low level in Aes Sedai hierarchy.
Nacelle was 145 years old when she died. She was born in 855 NE. She was Malkieri, in fact she is the only Malkieri Aes Sedai mentioned thus far in the series.
After the split in the White Tower, she joined Rebel Aes Sedai.
Because of her ability to read residues, she was one of the six sisters sent from the rebel camp to investigate the channeling near Shadar Logoth after the cleansing of saidin. She had developed a weave for detecting the use of saidin.