do toi think klaus will kill katherine ? why ?

Totally.
I don't think that she'll get away with everything that she's done. Klaus killing her will be her consequence.
And besides, Klaus is furious with her and EVERYONE knows Katherine is alive now, right? So, he'll hear and come looking for her. As "you can't hide from Klaus, he'll find you."

No. Kat is not stupid !

yes

maybe, but she's still stuck in the tomb.. sooo

yes katherine put his plan on hold for 500 years and he killed her family even when they did nothing and he has a warlock on his side so yeah

I think he will try but will end up dieing. Believe it ou not, Stephan does not want her dead.