Spoilers
If you watched the first hour of the finale a couple of weeks ago, you know that Sun has taken over her father’s company. A couple people pointed out that it must have been one heck of settlement to be able to do that, so it’s completely unrealistic that she’d be able to do that.
I agree that she couldn’t do that single handedly; but I don’t think she did. She went to someone who could easily help her do it: Hurley.
Even Ben, if Paik is in cahoots with Widmore.
I think it was all 5 of them – the 5 adults in the Oceanic 6 – just before she came up the stairs, his advisors were saying “whoever did it used 5 accounts”