Is my tarantula ok?!?

I posted this question before but i messed up and put it under the bird category haha! well my problem is that my tarantula is eating and shes drinking water but i noticed a few nights ago that her abdomen shrinked. i did some research and the only answer i got was that she was dehydrated. shes been drinking water like i said so is that normal? and i also noticed that she drags around her 5th pair of legs :/ im kind of worried because shes never acted this strange :/ whats wrong with my baby?!