Basically, our strategy was this:

1.) Main Tank pulls Jeklik to where I was standing.  We used the
warlock's imp to mark the location, plus of course it gives me
Bloodpact.  (I had close to 7K hit-points that fight.)

2.) All of your AoE folks then rush to get under the cave after she is
in position, and do range attack until the AoE call for the bats.  We
had a paladin doing Consecration right under the cave, did a good job of
keeping the bats there for the most part.  Occasionally a healer got
aggro, but nothing too bad.

3.) We had a warlock and a hunter (Viper Sting) draining mana at all
times.

4.) After she changes back into troll form, two important things need to
be kept in mind:

  a.) all rogues and warriors *must* keep kick and shield bash ready for when she starts
      to heal herself.  If she gets a heal off, it's a pretty much forgone conclusion, since
      casters, especially healers, are not gonna have enough mana to finish the fight.

  b.) The bats that drop the fire bombs: the main tank 'pulls' Jeklik back, out of the fire.
      Everyone must stay out of this fire; no amount of FR gear is gonna save your ass. No
      amount of healing is gonna save them either; they will die.  (You can see Vendrahga
      dying at the end; he lagged out just a second or two.)

5.) During the end of this fight, even more than before, the healers
must keep the main tank up. That means pallies as well.