Coconut oil has shown to be beneficial in slowing the progression of Alzheimer's and Parkinson's. However, it would take 4 teaspoons a day or more to see any results, and it takes doing it consistently for several weeks to months to begin to see results. The nurse obviously knows nothing about coconut oil and its benefits, so you will have to educate her and bring her up to speed, or you will have to be the one to feed it to your mother. I don't have much faith in asking someone at a care facility to dispense a food remedy that is out of the norm. It probably won't happen. Also, coconut oil does not cause diarrhea unless you eat too much at once. One teaspoon at a time is not too much.
It's important to note that the progression of the disease can be stopped with coconut oil, but it hasn't been proven to reverse all damage that has already been done. It works to stop it from getting worse.
Finally, while adding coconut oil into the diet can have a remarkable effect on brain health, the active ingredient in coconut oil alone is not the complete solution. Diet also affects brain health. What you eat can either enhance the effectiveness of coconut oil therapy or interfere with it. An improper diet can sabotage the beneficial effects produced by coconut oil. This explains why some Alzheimer's and Parkinson's patients who have simply added coconut oil without making any other changes to their diets have experienced only modest improvement. Some foods and food additives promote neurodegeneration.
A processed-free diet low in complex carbohydrates from vegetables, fruits and whole grains, rich in healthy fats including omega-3 stop Alzheimer's and Parkinson's dead in its tracks and bring about substantial improvement.