DS is 19 months and his appetite took a huge dive a few months ago. So if it's not teething or sickness, I think it's safe to say that it's very normal. Some days DS eats a lot, other days I can't get him to eat more than a few snacks. I have to let him guide me now as to how much he wants to eat. Go with her flow for a while and see what happens. Can she sign or say words to let you know if she is hungry?