Join Date: Aug 2009
Location: secret mountain valley
yes, she is choking likely. It sounds like a classic presentation. I know she looks horrible and probably seems like she is dying-Don't panic! It is almost never life threatening as it is different than in humans where the windpipe is actually blocked. In horses, choke refers to a blockage in the esophagus (tube to the stomach) so even though it looks horrible she can breathe.
There are some serious consequences to choke though such as aspiration pneumoia and scar tissue formation in the esophagus. The best thing you can do for her is put her in a quiet stall and don't panic her at all. As it was several hours ago, if this hasn't resolved by now I would call in the vet. Likely they will sedate and rehydrate her and possibly pass a tube through her nose into the esophagus to try and work the blockage into the stomach.
You must take lots of care with her feed for a few days to help prevent scar tissue and further inflammation. I personally went through this with my gelding last year and have seen a few cases in the equine hospital at school. Good luck, hopefully she is feeling better already.