As the people have said - offensive force powers are useless against her
Use the force to boost your own stats. enlightenment and valour come to mind, in addition stim yourself and sheild yourself.
Since your character is physically weak i hope you have some items to boost strength and/or overall defence. Hit and run is a must. You could try running away and force jumping her and repeat that. Dont bother with grenades, use mines if you have powerful ones and at the end keep away form the "distraction and go straight for her.