Yes. Period.

She's definitely old enough that she would want you to be happy and comfortable with who you are and by including her, you guys will be able to bond better. You won't be holding back any secrets. Now there really isn't anything to be ashamed of or feel guilt over.

Now incidentally, I had memory issues as well and have Major Depressive Disorder comorbid with Generalized Anxiety Disorder and the proper medications not only helped with the depression and anxiety, but my memory came back as well. So it might not just be anxiety (which it certainly could be), but a chemical imbalance in your brain making it harder to process memory.

Oh .. and congratulations! That had to be a rough talk, way to go.