@Born2sing20,
Is it's possible that it's a coincidence? After all, no one can replace you.
As a fashion statement, red hair has long been a trend. Curled hair is, too. Perhaps she's just changing her style to one that's trendy. In 6 months, perhaps she'll be blond again. Hell, maybe you will blonde then, too! Who knows?
But more importantly, why would you think he'd convince her to dye and curl her hair to look like you? Doesn't she have a mind of her own? Maybe you're not over HIM? Also, I surely make it a habit after a break- up with someone to not follow them on FB and, even more so would be the case if I got a divorce from them. Life is too just short.