nope! no special powers needed on her end! tulpas are just beings a person or group of people thought about so much that they became real. that's why i thought it being a human creator would be fun because they'd be like "...wait... why are you here?"
if you want to include it into the power she and her family do have though, assuming they see possible futures not ones set in stone - multiple women in her family could have seen a sister/cousin/daughter that your girl was meant to have? then it'd make sense why enough people had thought about her often enough that she came into existence?