Innocent or guilty?

This morning when I went out I discovered a little dead swallow/swift. Milly wasn't around at this particular time but I am afraid she has a criminal record, I am pleased when she kills rats - although not when she brought one into the house squeaking and I thought it was a field mouse, in trying to distract her she dropped it and it ran into the kitchen where it hid for 2 days before she finally got it. Needless to say I won't be making that mistake again.