I tried contacting BW and just got my answer:
I hope this reaches you well.
Sadly we are unable to progress it for you, the only instance that we are allowed is when the story mission is stuck due to some game issues/bug. I understand the frustration, but you can try again after gaining better gears or as you mentioned you checked for tips online, you can also watch how others defeated her to get a better idea/shot the next time you fight her.
I tried this all and also used to tips and tricks of this thread but it still didnt work, i just dont have enough health, about 70k, i use revans chest and leg piece
I am a sith assassins btw, and i am beginning to be so desperate i will ask people if they want to defeat her on my account or i will stop playing if its stolen, i havent put really much money in the game