Bobbi Kristina Estate — Nick Gordon Did Her in with a ‘Toxic Mixture’ of Drugs

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Bobbi Kristina‘s estate has doubled down in its claim Nick Gordon tried successfully to kill her … but Nick is calling BS.

The estate just filed legal docs alleging Nick and Bobbi Kristina got into a violent fight, after which he somehow injected her with a “toxic mixture,” which rendered her unconscious. The docs claim Nick then positioned his girlfriend face down in the…