While both are methylphenidates, they are different in formulation and time-release mechanism, so worth trying. If she had a horrible experience on Adderall she may very well experience the same on Vyvanse, since they’re both the same type, or she might do well on it. Impossible to know without trying.
A Patient’s Primer on the Stimulant Medications Used to Treat ADHD
Penny
ADDitude Community Moderator, Parenting ADHD Coach, Podcaster & Author, Mom to teen w/ ADHD, LDs, and autism