Don't bother going down at all to kill the birds... which might/might not have been obvious from the above, just focus solely on Alyszrazor.
I would not recommend doing this fight as blood.
e: Killed her at 565~ as DW frost. Could probably do it much lower as you have three air phases and I just did the one.
e2: i got bored- http://www.youtube.com/watch?v=oUHDKP_e0bw i'm not the greatest at frost and i screwed up with adds part way through but eh, no big deal