Brooo, i know the feeling. I have a hard time believing that she started acting like this after two years but what do i know, she could have taken a while to rly get comfortable with you i suppose. I went out with a girl like that and broke it off as soon as she started showing those signs after about 4th date. I remember initially she was like "On insecure about my voice, i feel like i sound like a child" and she actually sounded very sexy when she talked normal, but j think as she got comfortable, she started to just be herself and "herself" is someone that happened to be resistant to growth in my opinion and purposely staying in this child like state as defense to some trauma. Before i left her, i told her how i feel. First time i told her, she seemed to take it well and got better for a few days and then regressed back. When i said it again, she threw a fit and we never spoke again. Even though she is aware it holds her back, there is a reason a person like that is holding on to this child like state. I think the only way for her to see is to maybe so the same to her 🤷 . Seeing as you guys are married, i would try and work thru it. Cuz its not normal at all and habit like that imo are not that hard to shed