If a healthy, anorexic woman (5'1''/75 lbs/never exercises) won't eat or drink a supplement drink and is tube fed, how many calories does she get daily from the feeding tube? I hope it's less than 800 calories.

Theres no such thing as a "healthy" anorexic woman. There is nothing healthy of standing 5'1" and weighing only 75lbs. Feeding tube ingestion is measured by volume and caloric intake. The one administering the feeding, knows well the caloric value. No-one but that person could factually answer your question. I suggest you inquire of the care-giver.