OMG! okay so this might be a far stretch... but heres what i just thought of!
so....
Tanya comes down for the wedding with all of the Denali coven. She and Edward talk (blah blah) and they laugh and she says the quote.
THEN (okay heres the far strech, but hopefully not TOO far, cuz i like this possibility) Everyone goes to sit for the wedding. Jacob and Seth and some more werewolves are there, and Jacob sees Tanya. And he imprints on her! i think that would make it a bit like a midsummer nights dream, no?
and so the drama could come from edward going for tanya, and bella for jacob, but then (just like in a midsummer nights dream) everyhting gets all bandaged up, and WHOOSH! hapy ending! Jacob and Tanya (even though she is a vampire, the legend never said a werewolf couldnt imprint on a vampire, right?) and Edward and Bella end up together and Bella becomes a vampire.
As for the possibilities for Bella's power as a vampire....
here are my thoughts.
Since Bella hates the smell and the sight and pretty much anything to do with blood, I think she will have AMAZING self control when it comes to her "thirst".
and since she has such a shielded mind, i think it will grow stronger, enabling her to do some kind of shiledy-thingy to protect herself and others from people. maybe something like making everyone freeze?? idk. but it will have something to do with shielding i bet.
so ya.
long answer no? ahahaha
but i still like the idea of Jacob imprinting on Tanya.
and here is a scary thought. What if the Denali coven is there because a war is going to happen? as in all vampires reunite, and all werewolves. then in the end they get a truce done. but still.... it scary to think about it....
anyway! i hope you people liked my answer!