In Idol voting patterns, it is far better to suck memorably than to be forgettable. Syesha, Ramiele, and David H. were, IMO, the most forgettable, and are the most in danger. Kristy will get voters who want to 'save' her, and she's the only country singer, which gets you some voters. So I think she gets another week.
There's also a pattern of people with truly horrible performances being safe on the week of the bad performance, and then going the following week when they were much better. So I'd say Kristy goes home next week instead.