Re: Trying to make changes
No offense, but really?
It's her hair and body. She can do whatever she wants with it. Give your opinion, and then let it go. If you love her, love her. Not her hair. Who she is inside is what matters, not her looks.
Good for you, really, if you think about it, because you can now have multiple looks from her!
For example, my wife likes to dye her hair burnt/hint of red at times. I hate it. I have never told her this, because she loves to do it. I love her natural black hair. I told her once, that I loved her jet black hair, and she changed her hair to it for a year. Just 2 days ago, she dyed it back to the reddish hue. I saw her, and was like, Wow, you changed your hair! It looks great. and left it at that.
Let your wife do whatever she wants with her hair.
Sounds like you have bigger issues then hair style to deal with.