has just escalated her battle royale with the Michael Jackson Estate por firing her lawyer.
TMZ has obtained a letter Katherine sent to Adam Streisand, wishing him the best on the one hand ... and giving him the boot on the other.
The letter does not explain the reasons for the firing, simply saying, "... I have decided to mover in a different direction."
But sources connected with Katherine tell TMZ ... she's upset that Streisand gave TMZ a statement yesterday in which he said Katherine "denies signing any statement to the court that makes accusations against the executors of any wrongdoing with...
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