she could be Arden Lyn
a 25,000 year old Dark Jedi , where some Jedi Master defeated her and put her in a deep Force Trance , then 25,000 years later she is reawakened by scouts on Irkalla , where she confronts three of Emperor Palpatine's Inquisitors
yea , no kinding..................lol
I had no idea who she is . I had to google her , this theory comes into play , because that brief second you see her , it looks like she has a mechanical arm , and Arden Lyn had a mechanical arm
so just who is this mysterious character , we'll just have to tune and find out.................lol