While it may be possible to beat FK13 with what you have - you shouldn't be trying to force it. You need a full team of 60s. 

Specifically, I would bring Kreela, Uugo, and Gorgorab to 60. Those three, plus Ronda and Bellower, should go a long way towards being able to clear most dungeon content - including FK13.

I also wouldn't waste any more resources on Elhain. Hold on to her, since she may end up being useful in other areas, but don't bring her to 60 for the time being.

Thank you for the