It sounds like you're already doing what you can. At this point all you can do is wait and see what happens. Hopefully it will pull through. I'm not sure how long you've had your rosea but if it was wild caught, as many are, it may have simply reached the end of its life span. Perhaps one day we'll discover a species of immortal Highlander tarantula that duels through the centures until there's only one left. Until then, the occasional, inevitable loss will remain part of the hobby.
definently looked like a death curl not grooming
sorry I have nothing to take a pic with. But to maybe narrow some things down, it had ALL of its legs curled underneath it, so it looked like a death curl to me. Thankfully it is looking better now it has uncurled itself and every once in a while will move its legs. The bad part is that 3 or 4 of its legs are kind of deformed a bit. But so far its looking better.
Just take care to give it easy prey, I have a T with 5 properly formed legs and it has been doing quite well after its initial recovery. Granted it is a P.muticus and is still very tenacious, but I usually give it dubia as those are slow and don't put up much of a fight. After a month of staying in a buried vial I gave it to hide in, it has made a nice tunnel system. Hopefully after a few meals yours will perk up again.