It's a good thing I saved quite frequently
I went back to a save i had before the castle. I had Force resistance gear but I didn't match the prestige: the two levels I advanced only allowed me to learn powers or general abilities (no feats etc). So I got myself the Force Resistance power to max and it did the trick quite well! <spoiler>
The old lady kept trying to use her force powers over me with no success. She ain't a master swordswoman so I handled her just fine.</spoiler>
<spoiler>
The three floating sabers were on the same "difficulty level" of Traya herself.Since she was on a very high level (I trained her too well) it took some time to beat her and her sabers, but again -- she was helpless without her force powers!</spoiler>
Thanks for the help, guys!
p.s. sorry, probably should've written "SPOILER" in the title :P