Hi, Welcome to HealthcareMagic Forum.
Kindly do not try to make such mistake now and in future also. Give her Vyvanse
exactly as prescribed by your doctor. Do not give in larger or smaller amounts or for longer than recommended. Follow the instructions as given in the prescription label. It is a drug of abuse and may be habit forming. Keep track of the amount of medicine you give her. Using this medication improperly can cause death or serious side effects on the heart. So kindly do not try to experiment with the dose and give it as prescribed by your Doctor and take her for regular follow up.
Good Luck and Take Care.