You might need to tweak the bio a little. There wasn't really a Sith Empire, or even a Sith faction of any sort, in the timeframe you have her listed as a Sith agent and going on Imperial missions. The Sith and the Empire haven't really exited for more than 10 years or so I think.
Really confused by all these timelines. x_x Couldn't find any dates anywhere when this new Sith Empire was formed, according to this thingy, so I just assumed they were always....there?
Was there any sort of Sith faction before the Empire? If not, I'll just leave it as a generic Dark side cult or something.