She is implied to have a supernatural talent, as Carlisle believes. Siobhan can manipulate the outcomes of events. (Ex. When Maggie joined the coven, Liam was very territorial, but Siobhan wished it to work out and it did. Also, she willed here not to be a fight in the Volturi confrontation, and there wasn't.)
Siobhan will be portrayed by Lisa Howard in the upcoming Breaking Dawn movie.
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