Whiskers changing colour?

My ginger/cream tabby girl is around 7 months old and lately I've noticed that her cream whiskers are changing to black, one by one! Is there a reason for this and will they all change colour or would she just get the odd black one here and there?

I wouldn't worry too much about it. Is she showing any other symptoms? Since she isn't even a year old yet, she is still changing physically. Keep an eye on her, but I'd say that it's normal.