I don't know her signature specifically - I looked up a few in-person autographs from her being sold by known reputable collectors, and I want to say it doesn't look quite right. Again, I don't have a strangelhold on her signature, and certainly not any know variations.
That being said, I would stick to purchasing simplistic autographs styles like that only from top-rate dealers, specifically in-person collectors. Maybe opt for a slightly older, more full example like this: