Well, it's difficult to say, but, based on the jutting position of her jaw, it looks to me like she has something soft/rubbery clenched between her teeth and someone is holding or pulling on it. It would be hard to say what the object actually is, but what I can deduce with almost absolute certainty is that it's not anything "ghostly" or supernatural.
Is the original a print ... or what?
Maybe a reflection or a lens flare or something smeared on the image.
Sea story: About year 2000 somebody (a real nitwit, in my DAO) tried to prove a picture was faked based on a lens flare. 'nuff said.