Your sister needs to get a grip.

well, I feel like we don't get the whole story here. I don't think she would have been mad if you dyed your hair black or blond. Rather dying it a preposterous colour like pink or green would make her mad. Which in that case, I'd have to agree with her. while it is your hair and your decision, when dying your hair with a bold colour (especially if you weren't seen with it before) takes attention from the people around you. It's her special day, and she'd like the attention to be focused on her and her husband. Plus if it isn't some crazy colour, I'm sure it's just nerves. If it was already all planned out, small changes like this tend to make the bride/groom nervous. It's really not uncommon and you should probably talk to her about it. I hope she'll calm down and you can make it up

My sister uninvited me to her wedding because I mentioned in front of the groom that her dress had a train. She said I had ruined the surprise. She did invite me back after a few months, and made me her maid of honor. I wanted to decline, but my mother wouldn't let me.

Exactly! If a person is so insecure that another person hair color will take the attention away from her, she probably is so obnoxious that no one will ever be able to give her all the attention she wants. if you are so focused on appearances, the guests will judge every detail of the wedding. But if you are authentic, and invite the people you love, and who love you too, then it will be a beautiful wedding, no matter what happens

Okay, I'll admit that I told my sister she couldn't color her hair for my wedding. I liked that all my bridesmaids had dark hair. Plus, when she colors it, she usually does something weird, like add a blonde streak. Makes her look like a skunk. Wouldn't have kicked her out of the wedding if she had done it anyway, though.

My sister made her best friend Maid of Honor and my mom got really upset it wasn't me so my sister has two "Maids of Honor"