How much damage do you think Tanya will cause in BD?

My theory(based on the fact that Breaking Dawn will have something to do with A Midsummer Night's Dream):
Tanya will try to seduce Edward or try to put a stop to the wedding.

I think that Jake will imprint on her(even though the chances are pretty slim...)... After this she will make Edward THINK that he is in love with her, but by the end everything will work out for Bella and Edward...

I'm probably wrong, I usually am