Our 5 Yr Old Has A Heart Rate Of 112-120

Our 5 yr old has a heart rate of 112-120 for two days now. She was seen for a persistent cough & loose stool on Sunday & re-checked Monday. The cough has calmed down but her heart rate & loose stool has persisted. She is drinking tons of gatorade & peeing frequently. My call to the ped went unreturned today...