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It's true that some have teleport-like abilities but I think you've missed the part about one nen-part being conjuring itself, so in my opinion that would still be much easier. Also, this solution of a so called "freak accident" isn't the easiest nor the most convenient. She could have teleported gems, jewelleries, a check or why not change the numbers on her account? There's certainly some strange facts about this power and some heavy limits as well.
last wish being just a high end computer, Aluka will come up with requests like " put your fingers in this plug" or " please drink this poison"... things that Killua can handle without being put in danger... but i suspect that he wants to save Aluka too.. so it may become a bit dangerous, cause the only way to turn Aluka into an harmless kid again is to take on all the "grudge/payback" off the last wish and then ask to go "high high"...
then from here Aluka's wishes will be again totally inofensive... but i doubt she will ever leave the Zoldick mountain :P