@tisch- Good morning and welcome to Mayo Clinic Connect. I am certainly glad that you have found us. First off, if your child is ill then I would be certain to have her checked out. BUT it might be that she is copying your behavior? When I first became a mentor I was stunned by the amount of people who had/have SOB. It is a very common, or so it seems, symptom for many underlying causes. And there are many treatments and aids to help.
As you read through these posts you will notice what different people have done. Secondly have you contacted your PCP or other doctor to see what it might be? Have you had any other symptoms that you have noticed along with this?

@jwiegers17- I welcome you also. @gabrielm has done us all a very big service. I also encourage you to read as many posts here as possible because so many people have helped others find solutions. And that is in fact is one of the many things that Connect aims to do.,
I also suggest a GI doctor. It appears that GI tract problems/or infections can effect your breathing in many ways.
Most causes of shortness of breath are due to heart and lung conditions. Also too much acid in the blood from an infection, lactic acid build-up or other causes can lead to an increase in the breathing rate and the sensation of shortness of breath. Causes of acute shortness of breath can include: Asthma. But SOB doesn't always include asthma. It can be just GERD brought on by exercise. And it doesn't have to happen immediately.
So, can I count on you to try a GI doctor?