The most Sakura could do at this point before it turns into what the community calls "asspulling" are learning Slug Sage Mode, and learning Gates from Gai.
But even that can't solo the Juubi. Nothing can. It's going to be an all-or-nothing fight.
Well we'll see once it shows it. And you do have a point she did say that she'll fight along side Naruto and Sasuke and yet she just standing in the back and observing whats happening I like for her to like help them defeat them instead of just supporting and observing and I don't mind if she got another power up