Yes, if it feels like the medication stopped working, you should talk with the prescribing doctor. They may increase the dose or change medication. Keep a daily journal to track what she eats and how much sleep she’s getting. There could be an explanation for the change and journaling consistently can hell you find it.
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism