Welcome to the board, burnzey boi!!!
Killing Kerrielle only prevents you from doing her quest which can be interesting but will not prevent you from playing the rest of the game.
As Taski suggested, you can change your security options so that you can't as easily kill a friendly NPC.
Another option would be to reset your adventures and start again with the same characters - they'll keep their experience and almost everything except for any quest items you may have picked up. Resetting your adventures can be a nice way to build up characters early in the game.
Keep us posted on how your game is going!
Wyv
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