baby suddenly stopped drinking milk

Freak

i am pumping exclusively because of latch problem, she was able to consume 1-1.5 oz but today she is not sucking bottle at all and pushing it out using her tongue. she barely took 1 oz in a day. she has same number of pee but less number of poops. any suggestions what could have gone wrong? could it be milk aversion? or is it an indication of illness?