I think Michonne is a lot more skeptical than Andrea, also Andrea was passed out/sick when they first came to Woodbury. Where as Michonne was 100% there, would have seen a lot more stuff in the first few days than Andrea did.
She obviously saw something or saw through their little act because she refused to relax for even a second.
I thought they did a great job bringing her to the prison that way, really impressed with the writing this season.
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"In brightest day, in blackest night / No evil shall escape my sight / Let those who worship evil's might / Beware my power, Green Lantern's light!"
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