Apparently you haven't read anything about this case. Numerous doctors have said that if she was allowed various kinds of rehabilitative therapy (which she has been cruelly denied) she may very well learn to swallow food and water herself, as she swallows her own saliva.
This poor woman has not been allowed the treatment which would have been allowed an animal.
...because the money earmarked for treatment has been instead diverted to legal fees to kill her - while her lack of improvement is used as supportive evidence (hence "persistent" vegetative state, which itself is a lie unless "vegetables" can laugh and obey commands to open their eyes).