My 14 Year Old Daughter Suffered A Second Concussion In

My 14 year old daughter suffered a second concussion in March (both from playing soccer). Her first one was 18 months before that and she had a lengthy recovery. This second one was very mild, she was back in school in a week and symptom free in 2 weeks. It's 5 months later and she wants to go to Six Flags, she loves the roller coasters. She went on two small circular rides at a fair last week and was fine. Has enough time passed since her concussion that it's ok for her to try the Six Flags giant coasters?