Mary was more than likely awakened by the arrival of her killer.
It's certainly no less likely than the premise that she was woken up by a killer who simply intruded upon her, rather than knocking on her door and being invited in. She could easily have been surprised in her sleep and let out an "Oh murder" before being murdered, just as he could easily have opened the door without alerting Kelly to his presence and arrived at the bed with her still in a supine, sleeping condition.
Best regards,
Ben
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