Here's the thing: this is almost certain to get a request for a partial. That's how the conversation ends, with her saying, "Okay, please send me the first fifty pages."
So... you know that one sentence pitch you created on your ms? Now make it a 30 second (max) verbal pitch. Yippee, two or three sentences. Still, you'll be ready w/ follow-up...non-fic, why you're the person to write this; fic, appealing to readers of Kallos and Brooks. Whatever.
To answer your actual q, ya, I did the pitch thing once.
re how to get time, if you've nothing scheduled, then you're going to get your sweet self out there and network, create opportunities for contact, thank her for her presentation after her presentation, buy her a drink, tell her how impressed you were w/ her sale of x by y and of b by c. (You'll know all this because you researched.)