Thanks for writing your query.
Normal heart rate
, pulse rate is 50 - 100 per minute.
Since your daughter is complaining of skip heart rate related to exercise, i would advise you to get her electrocardiogram(ECG) done. This will help to know her exact heart rate & also the rhthym of the heart beat. If she has skipped beats that also can be picked up. Based on ECG finding further course of treatment can be decided.