You're speaking with Dr. Michael Salkin. Welcome to JustAnswer. I'm currently typing up my reply.
I'm sorry to hear of this with Bonny. Her dysphagia (difficulty swallowing) which is likely to underlie the reverse motion of her food and water back up into her oro- and nasopharynx is consistent with an acquired Parkinson's-like neuromuscular disorder at her very advanced age as well as a physical obstruction in her oropharynx or esophagus such as an inflammatory polyp or malignant neoplasm. I would need to directly visualize Bonny's oro- and nasopharyngeal areas but I do understand that the general anesthesia necessary to do so isn't likely to find something I can reasonably do for her and so such a diagnostic must remain necessarily circumspect at her age.
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