I don’t know. But I don’t know how you could go into a room where someone had been stabbed about 40 times and not get any on your shoe. It doesn’t mean she did it. Walking through a crime scene doesn’t mean one caused it.
From what I read Meredith was killed in her room, They claimed not to know where she was, faked a robbery and called the cops who found Meredith murdered in her room. It would be incriminating if all of the blood were in her room since they claimed not to know she was in there. Wouldn’t prove she did it but would certainly cast doubt on the story she told and would be incriminating.