Rejecting food/Aggression

My LO has been rejecting food since a while now, at first I thought maybe its because of teething or a phase but it has been consistent now. She would just take a bite and done! If given more, she would spit it out. I tried variety of food, including those that she likes but no success. I am worried about her nutrition. Since 2 days now, she has been so so so irritated and cranky that she just screams and try hitting if we disagree with her on something. I know that’s temporary but it’s getting aggressive and I am worried overall!!! Any tips?