Thank you for your question and welcome to ADHDCentral.com.
I am not a medical professional and would not be able to give you medical advice.
Children with ADHD are often several years behind their non-ADHD counterparts, even well into the teen years. I am not sure you can teach your child maturity but you can help to teach her social skills, by role-playing, by finding activities that interest her, such as art or music classes, where she can be around others who share her interest. Many children with ADHD tend to do better in small, structured environments.
For more information:
How ADHD Impacts the Daily Life of a Child
Role Playing to Teach Children with ADHD Social Skills
The Fine Art of Raising a Teen With ADHD
You may also want to speak with your daughter's doctor and request a complete evaluation. An accurate diagnosis is so important to making sure you have an effective treatment plan in place.