My post there does not imply Ahsoka will instantly die but an encounter with Vader would most likely be fatal to Ahsoka. Vader might try to turn her but I don't see Ahsoka actually doing it despite what older Ahsoka told her on Mortis and getting poisoned against her will by the darkside thanks to Son. Ahsoka isn't the wisest person however she tended to be portrayed in the morally right almost all the time on TCW. She's like the Sailor Moon of the GFFA. She is whiny, brash, and immature at times but pure and a true friend (I'm so sorry about this Usagi). IMO even when her mind has serious doubts she'll refuse the darkside.