last time I saw a wight in anything was in the MHI books. high level undead that paralyzed people with their touch, then ate them. Should be nifty to see if she is anything like that at all. there is something going on with her hands for sure
Technically in Old English a wight is just a living sentient being AKA basically they're just normal people. But due to the influence and BS-ing tendencies of DnD and J.R.R Tolkeinn, the name had taken meaning as higher level or special kind of ghosts with tendencies to be associated with the color white due to having the same pronunciation(in case you were pronouncing it in some other way.)
White walker in Game of Thrones is a common example of the 'special' kind of undead being created by a specific fashion with extra points to being associated with snow and ice(white stuffs).