I would suspect at this point she has sour crop. Mine didn't always have a sour smell but was bloated. I always vomited her at least once daily so the food didn't rot when she was bloated.
Here is another article on blocked Gizzard.
http://dlhunicorn.conforums.com/index.cgi?board=emergencies&action=display&num=1176631148
Here is another article on blocked Gizzard.
http://dlhunicorn.conforums.com/index.cgi?board=emergencies&action=display&num=1176631148
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