Having her snuff it would be interesting, but it's probably not gonna happen. It's shonen, main characters are almost certainly not gonna die (Kakashi noooo!). If Naruto was a seinen, they'd be picking up little bits of Hinata off the ground by now.. thankfully, it's not.
6 tails is crazy powerful, (or should be in comparision to 4 tails), so I'm feeling like Pain's secret weapon is gonna be all sorts of shenanigans.
1. Hinata jumped out of nowhere
2. She confessed her feelings
3. She tried to fight Pain
4. Got smacked the **** down (internal organs ruptured?)
5. Naruto got pissed.
6. Six tails and a skeleton formed.
you forgot to add : 7. Hes only chance to get a girlfriend vanish right before his eyes.