Hypothetically speaking, could a breastfeeding woman survive off of drinking her own breast milk?

My wife forgets her lunch at work all the time and complains about being hungry. I jokingly said she should just drink her own breast milk (we have a newborn) since it’s super nutritious, then wondered if thats actually possible. Whether it be a survival situation or a long term thing, would it cause health problems to the mother or is it an infinite food glitch?