I knew she'd be difficult to take down, the meagre bosses you find in Kotor 1 inspired me to create a new ruthless mini-boss in the crystals cave, you get a lot more crystals than usual and can upgrade the new Personalised crystal quite quickly so she evens the odds in a way. I was able to defeat her on difficult with shields, stims, grenades etc at level 9, but I took out the lesser Kinrath first before taking on the Queen. But she's a potent force user, and at lower health she gets rather nasty. As an alternative to fighting her outright use the demolitions backpack which gives you enough mines to kill her, and then some.