Yesterday Katy became a 'killer cat'

I had been sitting watching TV (as one does) Katy was in and out of the garden, through the living room window. I went into the kitchen to make a cup of tea aaaagh there was one very dead bird on the kitchen floor. Does this mean that Katy really loves me or is she just being 'unpleasant' ? I told her off and she just gave me that look that cats give as if to say 'what's the problem?'
