The last chapter (54) totally shattered Bella's unintentional illusion that her plans were without flaws that she could not fix. I'm going to assume that Bella and Edward survives, at least the rescue of the Werewolves - if not the duration of the story. As such, the most realistic way of surviving the encounter with the witch twins I can conjure up at the moment is that Bella is exaggerating the situation.
It's entirely possible that Alec and Jane have been too busy keeping the wolves incapacitated to do any interrogation - and to my knowledge; it's quite difficult to answer questions, or even hear them, when either paralyzed or gasping breaths between screaming in agony, anyway.
So the Volturi may not even suspect Bella of doing any folly - a situation she will surely use her quick wits to make the most of, both in short- and long-term. As Bella suspected, there probably are reinforcements on the way to deal with the wolves in whatever way the Volturi have decided, but Aro certainly doesn't have to be among them. If I read him right, he would rather stay in Volterra; totally confident that the witch twins and the reinforcements will bring him a few wolves to experiment on.
There's also what I think is the more unlikely possibility of Bella suddenly learning to expand her shield and using this new-found ability to make the packs immune to the twins - she did after all learn that their powers affected the packs collective minds, so why shouldn't hers? The most likely event to trigger this I can think of is if the Volturi are hostile and come close to killing Edward, making Bella desperate enough for a way to help him to subconsciously bring her ability to the next 'level'.
Anyway, great chapter that gave me much to think about, trying to predict where you'll go with it next. I love doing that. I don't love Rosalie being so eager to tell Elsie's parents to go die so she can be her mother though, but that's just Rose I guess.
All Bella needs to do is take out the two vampires with incapacitating powers. Once she does, the wolves can act as the anti-vampire killing machines they were born to be and take out the rest of them.
Once they do, her position's a lot stronger; Bella and the packs might be able to negotiate a peace treaty with/unconditional surrender from the Volturri, assuming they don't go onto the offensive and wipe them out once their big guns are gone. IIRC the werewolf packs outnumber the guard by, what, two or three to one, while being physically superior to boot.
In the vein of the Harry Potter and the Methods of Rationality discussion threads this is the place to discuss anything relating to Alicorn's Twilight fanfic Luminosity. The fanfic is also archived on Alicorn's own website <strike>(warning: white text on black background)</strike>.
Previous discussion is hidden so deeply within the first Methods of Rationality thread that it's difficult to find even if you already know it exists.
Similar to how Eliezer's fanfic popularizes material from his sequences Alicorn is using the insights from her Luminosity sequence.
Spoilers for the fanfic itself as well as the original novels need and should not be hidden, but spoiler protection still applies for any other works of fiction, except for Harry Potter and the Methods of Rationality chapters more than a week old so we can freely discuss similarities and differences.
EDIT: Post-ginormous-spoiler discussion should go to the second thread. (If you have any doubt on whether you have reached the spoiler in question you have not.)