I’d definately look into changing her formula. Also she may be teething or getting ready to. When that happens, babies sometimes don’t want to be bothered with eating because their gums hurt. But she DEFINATELY needs to be eating more then 3 bottles a day.
Some people advise against it, but I would try puttin little cereal in her bottle. She needs to gain weight. Hve you tried to feed her babyfoods yet? That’s another option. But please try something. Bbies can still be healthy when they are small, but her lack of wanting to eat is unusual. If she isn’t eating, her blood sugars could be low which isn’t good for her development. Also she will be come a little limp and lethargic and not want to do much but sleep. It’s a cycle. So try to put some more food in her. 😉