Nah, CJ doesn't know that it was
Gatekeeper who plotted to kill
Sean. As far as CJ knows,
the Mallers were the one's who offed her ex-boyfriend. So to get revenge on Gatekeeper someone would have to spill the beans (
Victor), and we Hispanic folk never spill our beans. That shit doesn't go to waste! lol
I think that was what Nik was saying too. That if CJ found out that she was lied to about the Mallers being responsible for Seans death, she might flip out and do some cray-cray shit, like ventilate
Lizzy's skull, OR, oh shit and this might actually happen, reveal
Saul to the Mallers so that she herself can escape from the Mallony! Damn, I can totally see CJ using Saul and Lizzy as a diversion so that she can snatch up the SAT phone and leave the star-crossed lovers in the Mallony!