She's hard. Stalling doesn't work, at least it didn't for me, she'll just re-buff. If you stall too much, she'll djinn storm after a buff too. Believe me, you don't want that.
I found what helped is to whittle her down with my less than optimal party, after buffing up my "best" characters as best I could, and have them sit around forever, until you know when.
I also found that sword of rapture doesn't have a 40% success rate per stat, it seems to have a 100% success rate with speed and some other stat (mnd maybe? or was it def? it was always those 2 for me), important part being speed of course. Just make sure you get enough regen gear on you know who so you'll be able to afford a sword of rapture after a djinn storm relatively quickly.
I beat her before she could even Resurrection or Volcano :V
Weren't you told cheaters never win? =P