I would like a second opinion

So, for the story I’m writing my main character has ADHD but she doesn’t know it and she’s afraid there’s something wrong with her and it’s her fault. I want a scene where she talks to her friend and her friend says that there’s nothing wrong with her. Her friend says that she has ADHD and explains what it is and how it works. The scene is supposed to be a revelatory moment where she realizes that what she’s been feeling isn’t her fault and she’s able to keep moving forward. The problem is I feel like I’m derailing the plot for the sake of a PSA about ADHD and I'm not sure if I want to keep the scene or not.