Sudden drop in milk production

My daughter is two weeks old today. She refuses to latch so I have been exclusively pumping. I was getting about 3-4 oz total every 1.5 to 2 hrs normally. Yesterday it started where I am only getting an oz total per session which has spread out from every 2 hrs to 4 or 5 hrs. I'm not sure what to do to help increase or why it would have changed so drastically over night.