Sigh...I hate that people misintrepet this so badly...
Let me put this in layman's terms.
I go to your bathroom sink and take a swipe. Said swipe will have your genetic profile on it if you used it to wash your hands, gargle, brushed your teeth etc.
Next, I cut myself and wash the blood off in the sink, then take a swipe. The swipe will show a mix of our genetic profiles and the presence of blood. It will not tell us which genetic profile came from blood and which didn't.
Thus, your quote proves nothing other than that somebody washed MK's blood off in a sink that AK regularly uses, and their genetic material became mixed. This is why forensic techs absolutely hate it when a suspect lives at the scene of the crime - otherwise telling dna & print evidence often becomes useless unless you wish to insinuate that it means more than it really does to a non-scientifically educated jury (as often happens, much to the dismay of the various forensic certification boards).
In layman's terms, her blood was there... not just her dna. Therefore, when there is no blood of hers there the day of the murder but there is the morning after the murder... she is left in a bad way.