means nothing other than she won't go to court. That's it.
She won't be going back to court as a defendant -- but you may rest assured she will be going to
civil court as the plaintiff in one hell of a damage suit. And once that is settled she very well could be going back to criminal court as a complainant against those cops, at least one of whom could be looking at prison time.
Once the charges against her were withdrawn she was immediately eligible to prefer charges against those cops. The fact that those charges were withdrawn makes it clear that the DA's office thoroughly investigated and found them unsubstantiated -- meaning
false.
Those guys are in serious trouble.