Hi My 10 Year Old Is Healthy With No Underlining

Hi my 10 year old is healthy with no underlining health issues as we know of.. my question is, she has been having to take in deep breaths very frequently ever since she went on a roller coaster ride.. it’s been 9 days and has not gone away.. we tested her lungs oxygen levels, they were good.. her X-ray showed nothing, we had an electrocardiogram and are waiting on results.. what do you think this could be? Should we be concerned for any heart issues? Or could it be an allergy from a cat we recently got? We’ve had the cat for 3 months prior to her getting these breathing abnormalities so I’m kinda ruling that one out. ??