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After 10:30 put more suspicion on her. If she was blacked out, she would be included in the list of top suspects because she has no idea what she did. To extend the timeline 4 hours opens up the case to include more candidates.
I don't buy that because she follows it up with 'there is no way anyone could have got in' which I take to mean there is no way anyone could take BL prior to 10:30pm. She purposely tries to close the door on an abduction happening prior to 10:30pm. From that interview:
“So, it’s possible you did not check on her before you went to bed at 10:30?”
DB: “Yeah. Yeah. But there’s no way that anybody could have got in.”