Ditto, that's what I did and it was easy. Also there's power conduits on the side walls and if you shoot those (and are immune to electric - aug) then she'll get stunned if she's in the same contigous block of water. You can also see her footfalls in the water to chase her around. If you lose her and when you get warned she's coming, a quick glance at the minimap will tell you from which direction. She was actually rather easy.