Yup, I felt sure she was referring to Amber as soon as Shii started that line of talk, and since I am about as psychic as an IKEA tabletop, I have to assume I reached this conclusion because the TV show presented me with reasons to do so.Like others have said, Amber being outted by another player as the likely winner at this point in the game is grounds for suspicion. I would now consider Amber in serious danger of being voted out at the next Tribal Council because these players ARE reaching the most paranoid they'll ever be in the game, and I think Shii Ann's speech will have effectively played upon that paranoia. Rob in particular must be worried -- the uncertainty he has expressed about Amber's loyalty will have been particularly piqued by Shii Ann's comments. Rupert and Tom may both be surprised into action by suddenly having Amber's strategic capabilities shown to them, because they've always perceived Rob as the powerhouse and thus the threat in that pairing. Jenna, thinking that she could not beat Rob in F2 but has a chance against Amber, might now be shaking in her shoes that Amber would also beat her.
Of course, it may be the opposite -- that what we see from here on out is Amber Amber Amber all the way, as a process of justifying her win. She survives not only having a target painted on her back by Shii Ann, but she enters Final 4 with stacks of gameplay and skulduggery still to come -- which we haven't been able to witness much of thus far because it doesn't fit with the Sweetheart role she's there to play. The only thing we've really clearly seen is her indicating that she'd be ready to dump Rob if that were necessary for her to move forward. That DOES fit with Amber being the winner. MB had to show that in earlier episodes, even though it clashes with the Sweetheart thing, so that it doesn't come completely from out of left field when the Sweetheart does actually get rid of Rob.
So I'm very much of two minds about what it could mean that we were shown Amber as the likely winner last night. But the point of all this was that, for whatever reasons, it seemed pretty clear to me that Amber was being indicated, rather than Rob. Whether that is preparing us for an Amber win, or for her imminent boot, is the part that better spoilers are going to have to figure out for me. ::grin::