B.S.
I wish people could understand that sleep is controlled by the brain, not by hunger. She should read "Healthy Sleep Habits, Happy Child", it's a wonderful book that clarifies a lot of things like the fact that until a baby is around 4 months old, he/she will not have a normal and reliable sleeping schedule. Also, all babies have digestion issues which tend to peak in the amount of problems at about 6 weeks but then they get better due to lack of melatonin which isn't really produced by their brains until they're between 3 and 4 months old. I can't recommend this book enough. If you're a true friend, buy her a copy, she'll thank you.