She has fallen victim to the global melanin harvesting conspiracy, which has robbed her of her skin's original pigmentation, and said melanin has been sold to rich whites so that they can harvest its magical properties. Or, more seriously, the old her most likely spent significantly more time outdoors than the current pasty-faced idol and thus was tanned.
And yes, the magical melanin and melanin harvesting operations I mentioned at the start of this comment are a real conspiracy theory that gets promoted among certain circles of afrocentrists and black supremacists.