My crab did this weird thing and cloned itself...and it was upside down and grew the missing 2 legs it had ...So i turned it the rightside up, and the crab seems very stiff now. ...She's been like the for 2 days now...so weird...is she dying

here's a pic to see what i meant by cloning...

Crabs can regrow appendages. I caught many many blue crabs as a kid that were in the process of doing so. I don't know about the lethargy or stiffness though.