I hope so, but if she talked, wouldn't they have the body by now? Still seems like they are searching in different areas, following more than one lead but not not following specific info.
IMO, she doesn't have any incentive to talk at this point. I think she's holding out info about the location until/if she is actually charged with murder. Then, I think she'll talk. She is in especially good position if they charge for murder without the body - then she can say, "Make me a deal and I'll tell you where to find Jennifer."
MT is stone cold, imo. Right now, I think she is biding her time with the ankle bracelet - working on a defense on the charges she currently faces, which don't have that long of a sentence if she is convicted of them.
jmo