Final answer:
Callie's medical problem as a toddler is not specified, but based on her symptoms, it is possible that she had a gastrointestinal problem.
Step-by-step explanation:
The medical problem that Callie experienced as a toddler is not specified in the given information. However, based on the description of her symptoms, it is possible that Callie had a gastrointestinal problem, such as gastroenteritis or a digestive disorder.
These conditions can cause symptoms like severe abdominal distress, vomiting, diarrhea, and fever, which are mentioned in the provided information.
To determine the exact medical problem, further evaluation and testing would be necessary.