17mths baby dont want to eat and drink

My daughter is 17mths. Recently she doesnt wna drink her regular 3 milk feed at 190ml. She will omly drink ard 30ml and push away. Food sometimes also doesnt wna eat much. any advice? isit because of baby led weaning? Can she stop drinking baby formula or? I dont know whts wrong. Cant be teething cos her teeth all shld fully out already.