(5,2) is good. (6,2) is even better, but if somebody really wants her out it only takes one vote to get her immuned for a round, then back down to (0,0). When she is on (0,0) it's equal, she can be booted or immuned quickly, if you know what I mean?
If she suddenly gets tons of boots, it only takes 1 or 2 quick immunes to save her from being booted. Where as if you keep immuning her (meaning she keeps going to (0,0)) it's going to be much harder to immune her.