It's not clear why Sanchez appeared on the show, since Mike Hendricks, not Sanchez, is the Star columnist who made national headlines after essentially blaming all pro-life Americans for the Tiller murder.
A commenter on the Bottom Line site who seems to agree left this comment:
"... Why was Sanchez the one debating O'Reilly? Where was Hendricks? He's the one who called O'Reilly out. Sanchez is one of the few at The Star who is remotely pro-life...
"... Sanchez was nothing more than a smoke screen for the coward Mike Hendricks to hide behind. If anything her appearance in Hendrick's place made The Star's coverage of this issue even more disgraceful than it was before."
Update: in comments, the word is Mike Hendricks was not invited on the show, so it isn't accurate to say he was AWOL.