In that case - and I agree with what sundaaaay has said - it's quite possible that she went looking for some friends/neighbours who might be at home. Close enough not to need the taxi. But didn't find anyone in
Where was the house party she was at earlier in the night ? Friend put her in taxi and gave driver the home address, he dropped Libby there as instructed but she decided she wanted to party and tries to make her way back to the house party which might still have been on ? Might explain why no apparant attempt was made to go into her house ?
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