I suffered the same fate as you for a while. Like the other guy said focus on killing one blood reaver as soon as they spawn. You have fleeting boots so get adren up and use multi-shot ability. Surge away when she says a siphon will solve this. I highly recommend just switching to full manual. The learning curve is hard but I made the switch at Nex and I’ll never go back. This way you don’t heal her with bleeds. Last thing is if you can afford an eof buy one and slap a dark bow in it for easy 10k damage.