Nice, that's not a birthing tank...it's a birthing suite. LOL I'd leave her there.
How long has the birthing tank been set up? Have you tested your water?
Hmmm...water sounds fine. Is she breathing normally? Will she eat?
Is the tank well aerated? If so, I would just turn out the lights and leave her alone for awhile. It could be stress from the move/unfamiliar surroundings or we could all be wrong and she is closer to dropping then we all thought.
Not to be morbid, but I have performed many successful post-mortem C-sections...just something to consider if she doesn't make it.
Yeah, I know...sorry.