Makes perfect sense to me. There had to something that causes them to raise the alarm. She attempted to cover her tracks on the blood in the bathroom. She talked about her ears possibly bleeding, how she scratched the blood in the sink, and how Meredith was possibly having menstrual issues.
Why would they need something to raise alarm? Why raise alarm at all?
Why cover the traces in the bathroom with stories while pointing the traces to the police instead of simply cleaning them? This one is really baffling to me.