They definitely could cover LaGuerata's death by saying Deb followed her (which she did) to find out what she was up to, found her having just shot that bad guy who Dex killed and she was hysterical and Deb had to defend herself from her.
They already set this up by making LaGuerta look like a lunatic trying to frame Dexter and this will be the payoff, Debra will be able to kill her and get away with murder...but she will still have to live with the truth..

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