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In other thoughts...
That's fucking dumb that the cops won't do anything. Has your friend tried to press harder on them?
Maybe what she needs is proof that he is compromising her accounts and using it for his own intents, be it on paper or online correspondence. Maybe bait that tool into getting caught red-handed.
If all else fails, she could try consulting a lawyer. Might be a waste of money (even for consultation), but if she's desperate enough, lawyers always want a way to make your money.