Developing Caleb's idea a little, if she doesn't know the full extent of her powers maybe she's trying to find their limits (think children pushing boundaries, but with lethal weapons). If her powers only work when she "means it", but she doesn't think they extend as far as killing someone, then she could "really try" to kill him while not actually expecting to succeed. I'm not sure if this is anywhere near what you've got in mind.
It would mean that the killing could be totally cold and lucid, but I'm not sure how you'd deal with the emotional after-effects of killing her love - unless you've already got some ideas about that.
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