Yrden-run behind her back-strong attack to death.Assassin abillity really helps here.

Just cast quen and attack it straight up front.
3 quens(upgraded to refelct dmg/absorb more) is all it took (on hard).
That was with no potions/oils tho.

I killed both of them the same way. I created about 15 high damage frag type grenades. can't remember their name and just bombed her down to about 3% health I then hit them with a stun and a few light attacks and they were done. I find bombs very usful in most big group fights. Seperates the wheat from the chaff.

Well i just went head on. No traps and only the shield spell.

The creature spawn. You circle around it for a while until it charge. Make it charge into a "wall" (tree / rock), Pref one with a corner. Go up and whack it like 15-30 times in the back depending on your weapon. Win.

Daggers.

On Hard - are solution to everything

Old, thread, I know.

I did an experiment with traps. I laid them down along the path and stood at the end. I stood and watched as she died. I counted 15 that she had sprung on the way to me. 15 snares and she dies. I took no other action.

Yeah, I ended up just bombing her to death. She didn't even touch me.

With both Queens, I just ended up boxing them up against one of those big tress and just had at them with my trusty Silver sword. Didn't take too much damage in the process. Seems like they lost some of their offensive capability and were on the defense ( better them then me ).

Even though you have beaten the bitch already, aard is also pretty usefull against it.

I was spaming quen but that didn't work for me. I had 3 vigor slots, no daggers and didn't use any bombs. My final strategy was: aard +1 heavy attack+2-3 light ones, roll back and repeat