Quote: I agree with @DwayneNLiz it could be a number of things, so vet care would be best.
The first thing that comes to mind with her stance (photo) and your description is being egg bound. Try to encourage her to drink - dehydration can make it worse. Don't worry too much about feed at the moment - you can make it available but if she doesn't eat that's o.k. as long as she is drinking.
Giving her the TUMS is a good idea. Fast acting calcium will hopefully help her pass the egg if there is one on it's way.
It's possible that she may be suffering an internal laying/reproductive disorder like Egg Yolk Peritonitis. This is where the egg or egg matter has traveled back up the oviduct and dropped into the abdomen. There's not much you can do if this has happened, just waiting it out to see if she improves. I know you don't want to hear this. If this is the first time it has happened, it's possible her body will absorb the matter and she will begin to recover in time. Egg matter in the abdomen can also fester and cause infection - again, only time will tell. Antibiotic treatment is usually therapeutic for internal/repro infections, meaning not that successful or successful until dosage period ends, then you start to see a decline. Talk with your vet to see if they can give you some Baytril or an antibiotic in the "cycline" class.
Hopefully she is bound and an egg will appear soon.
Keep us posted.
Peritonitis and internal egg laying issues:
http://www.chickenvet.co.uk/health-and-common-diseases/egg-laying-issues/index.aspx
http://scoopfromthecoop.nutrenaworld.com/tag/laying-issues/
http://www.hobbyfarms.com/livestock-and-pets/6-causes-of-chicken-swollen-abdomen.aspx
EGG BOUND
http://www.fresheggsdaily.com/2012/06/egg-bound-hens-how-to-recognize-treat.html
http://www.the-chicken-chick.com/2012/07/chicken-egg-binding-causes-symptoms.html
http://luckyhensrescuenorthwest.weebly.com/egg-bound-henegg-peritonitis-help-sheet.html
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