I know this will be unpopular but just another angle.
What if it was a robbery gone bad? It appears they came face to face. Perhaps she was carrying a load covering her mid section and the perp was so frightened the adreneline took over and the best place to stab was face and chest.
And using the church's tools? What burglar and or murderer, or hit person comes unprepared. Unless of course, the perp had the presence of mind to take his/her belongings with h/h?
I suspect he escaped the way Missy came in. Doors were open and it was the quickest and easiest way to get outside.
More questions than answers, I'm afraid.
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