I doubt it matters how tough the questions are. She has no qualms about lying through her teeth and is deft at spur of the moment lying. Because of that, I don't think there will be any "gotcha" moments or revelations of any sort. Just more of the same deflecting, blaming, lying. It's so second nature to her that it's actually first nature.
I look for her to continue to play the martyr, victimized by the system and by everyone in her life. I think she'll outright trash her attorneys, the prosecution and the public, and take subtle (or maybe overt) digs at Travis and possibly his friends and family.
Fortunately, I think all she'll succeed in doing is making everyone (including any potentially naughty juror she might hope is watching) dislike her even more. She's so lacking in real substance, so contrived and insincere -- truly soulless -- there's absolutely nothing there for anyone to relate to.