I also like 2 take the flying shredder thing, it can damage her when she's firing at you because normally you can't damage her when she's firing at you.
take reactive armour when your out to kill a razor queen, so when she starts firing spikes at you if they hit you they will do nothing. Also when you get hit the armour explodes and damages her again. you need to hit her 5 times for her to die.