Alida Knobloch as of today, is only 3 years old. She lives in Louisville, Georgia. While she is a normal, playful, silly girl most of the time, but because of her disease, the only way she can stay healthy, is to carry and oxygen tank everywhere with her. This really limits her activity options.
Oxygen in the tank can run out eventually, which if not mentioned, would be bad. Alida can feel when her oxygen is running low, so whenever it is, she will say “my o is running low” her “O” being her oxygen. Her parents will deal with the rest.