How do I get my 16 month to sleep through the night. She wakes up twice every night screaming for milk

At this age, she is probably used to night feeds, not so much due to hunger. How does she go to bed at night? Does she need her milk to sleep? If so, she associates sleeping with milk. Hence when she wakes up in the middle of the night, she will be looking for milk to go back to sleep. You'll need to change her sleep association with something else, probably a bolster or a blankie or a pacifier..... It won't happen overnight and you'll have to be very patient and consistent. Mine is still happy with her pacifier, still wondering when a good time is to change that...