Well it seems like Rand has some pretty godly powers so it wouldn't be surprising if Nakomi could change the way she/he looks. 

My theory is she was the Dragon Reborn in a past age. I've heard that the same thing seems to happen where the Dark One gets locked up, then set free, and stuff, so why couldn't the same thing that happened to Rand happen to another Dragon. It seems like Rand is able to do impossible things so it wouldn't surprise me if he never aged, so maybe Nakomi has lived for thousands of years in secret.

In a Crown of Swords, Sareitha (An Aes Sedai) says, "I also recommend a firm does of the slipper at regular intervals..." It's probably obvious, but what does this mean?

Did Berelain and Rhuarc have some love thing going on with each other in Lord of Chaos?