Yes, if it's a felony, he's entitled to a 'probable cause
hearing' within 10 days of his demand for one. I had a client who a P.D. was trying to accept an 8 year plea bargain, and I just scheduled the date for it, and he was released since they weren't ready, charges dismissed.
For all I know, he could be incredibly caring, compassionate, and it could be part of a great strategy, but from this perspective, it does just seem like he's taking your money (or already has), and isn't giving you much if anything in return. That's the down side to flat fees, since some attorneys then don't have an independent drive to get your fiancee out ASAP. If tomorrow (or today), the attorney answered 'ready for trial,' the case would have to go at most 10 days from that date.
The courts must be significantly overburdened, if the judge is allowing that too, since they normally will prioritize in custody cases and get the attorneys to make a deal or go to trial even if they're not ready to do so.
Yeah, the D.A. isn't returning my calls is not a valid excuse to allow someone to be imprisoned who could otherwise already have been released. But you don't have anything to lose by at least consulting with a P.D., and seeing if he or she would be a better representative. (I know PDs have a bad rep in general, but I was one once, and know that some of our best criminal defense attorneys are there...and I'm still getting accustomed to having to make clients pay for services I used to be able to do for free).
But if you've paid him so much, you at least deserve a clear explanation of what's going on. I reccomend you do that, and seek out a P.D. if he doesn't answer and return your call. But unfortunately, just like private attorneys, getting a P.D. can also be a crap shoot, so that's why I'd definitely reccomend ensuring you're eligible first and then talking to someone in the office to get their opinion on it. (It's kind of like a free second opinion from a doctor, although they most likely won't have the same info your attorney does, so I'd ask him to make you a copy of that pronto too).
I hope all this helps and that things work out in the best way possible for you and your fiancee. I really wish I could do more for you, since at minimum, you and your fiancee deserve to know what's going on, and your attorney has a legal duty to keep him informed.