WOW 
Natalie just told Sheila that if the three of them (Ryan, Adam & Sheila) don't back her HOH nomination to evict Josh, and one of them flips and votes for Josh spliting the vote 2-2...That Natalie will break the tie by keeping JOSH. Natalie says that if her group flips on her, she'll flip the house and join James and Josh!
I'm sure it's just a threat, but HOLY MOLY BATMAN is she nutz or what 
yep!,,,, this is what will get nat evicted, we know all 3 are voting out josh but for nat to just say this , hey i am looking out for myself [to her allaince] shelia,adam, and ryan will take nat out for even thinking this, [wow she plain out said she is working with james] i hope nat mouths gets her in the end, i hated the way she handled her hoh....JMO
I honestly think, that Natalie thinks, her only competition is James. From your post, when you said that she actually admitted it, I finally saw this.
NATALIE ACTUALLY THINKS THIS: Natalie's team vs James team.
That's how she sees it. She's basically saying that she won't protect them anymore if they don't do what she says. She doesn't think anyone else is a threat anymore and she'll help the "losers" if they obey her. WOW