What good is the grand jury testimony of a drunk ho? There's no case here at all.
I agree that her story stinks to high heaven. However, in many states no one will care if she has lied to the police because there is no major penalty, at most a misdemeanor. However, if she is forced to testify before a grand jury, and if she lies, she can be charged with a felony.
I can almost guarantee you she will not be called. Nifong will shuck and jive about how traumatic the whole thing has been so he will have the reporting officer sworn in and read her statement.