She could be dying from shock. Get her started on the electrolyte water, nothing else, immediately.
Measure out one cup of water and stir in one teaspoon sugar with a pinch of salt and baking soda. Give as her sole water source for the next 48 hours. That means take away her access to plain water for two days.
Measure out one cup of water and stir in one teaspoon sugar with a pinch of salt and baking soda. Give as her sole water source for the next 48 hours. That means take away her access to plain water for two days.