Baby won’t eat?

Br

Formula fed..just found out yesterday she has a milk/soy allergy from blood in her stool. Changed her formula to Similac Alimentum (she’s had it before) and was taking it fine yesterday. Today it seems like she hates it or something? She’ll act hungry but when I feed her she takes maybe 2 oz and is done. She’s very fussy still so maybe her tummy still hurting? She usually takes 5 oz every 3 hours😰