I agree. You need to take the right steps to take care of you. Honestly, she should be grateful that you want to better yourself.
Try approaching the subject in a different way. When you tell her it will improve your life, she gets very defensive. Instead, mention exactly what struggles may improve. Things she notices and may have mentioned.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism