Baltimore is a sewer of corruption.
I suspect she’ll take it to a grand jury if it looks like she’s not going to get the judge she wants for the prelim.
A grand jury gives her a chance to stretch out a weak case because the process allows her to make a one-sided presentation without fear of refutation, and to do it all in secrecy. At a prelim, on the other hand, the defense gets a chance, and a judge who feels the charges are bogus can throw out the case.
If the judge’s nickname isn’t some variation on the word “Hanging”, there’ll be a last minute direction change to the GJ.