[1rudeboy]

. . . under the law in most states the police have no legal duty to provide protection to any particular individual under most circumstances.

Maybe in some cases, but in this case, the legal duty was established the moment she called 911.

[mvpel]

Actually, no - under well-established case law and statutes, a call to 911 does not impose a liability on the police. They'll get there when and if they can, and if you die in the meantime, it's not their fault.

One of the only circumstances where this principle doesn't usually apply in most states is when someone is under police protection for a specific reason, such as being a material witness in a mafia prosecution.