She's 23months and doesn't usually have a problem with food. All she's eaten in the past 2 days are a few bites of toast and a bit of yogurt. All she wants is milk. Every time I offer her food she looks at it, turns away and cries. She won't even attempt to eat it. Is this just signs of a tummy ache? Other than refusing to eat she seems to be her normal self so I don't know what's wrong.