She was slowly, slowly moving to the water yesterday when I just moved her to it myself. And then I did watch her drink as you described.The only way to truly tell if a tarantula is drinking is if you witness it moving to water on its own- face down fangs spread.
When this particular tarantula either recovers (doubtful) or dies, do not collect another tarantula until you read a good book like The Tarantula Keeper's Guide and learn to properly care for it. In the mean time, relocate any tarantulas you find in your area to a more remote place in the vicinity to protect them. The best thing you can do, as others here have stated, leave it alone with the dish of water and hope for the best. Your intervention is only hurting it more. Spiders are not pets, they're like fish... leave them alone and watch them!
Thank you for the book reference, and I do realize that you are most likely right in what you've said. After reading about Texas Browns for 3 days straight now, I have really just come to a fork in the road about them. Half of the information describes an ideal and docile pet. The other half describes a wanderer. SO, yes I will DEFINITELY do research and I can promise you this is only the beginning for me....