How much is too much?

My baby has been eating non stop for the last three days. She’s 15 months old and got her shots last week. About a week and a half ago she was sick and really only wanted crackers for a couple days. But now she wakes up and gets an egg and a piece of toast for breakfast. Then 40 minutes later she wants more. And 40 minutes after that she wants more. And then her nap. After she gets up she has another snack. Then lunch. Normally she has half a sandwich and some yogurt or fruit. And not long after she’s crying for another snack. Then she wants crackers. Then puffs. Then she gets dinner and she snacks as much as she can until bed.

Is this normal? I don’t want to say no to her wanting food but I don’t want her to be unhealthily eating all day. Her snacks aren’t really junk food but how much is too much food???