If she never offered to show her CI, how does she feel when you want to show it to other people and they want to touch and see? You say she doesn't seem to mind but have you asked her privately how she feels when you want to show it to others?
You brought back a memory of a time when my mother was talking about my new ear level hearings (I just graduated from the horrible Third Boob) and she lifted my hair to show someone and while I smiled politely, inside I was really annoyed. At that time, I was maybe 11 or 12. Then when my mother at another time reached over to pull my hair away to show the hearing aid better, I kinda gave her a look and pulled my head away slightly and she got the hint and never did it again.
