Just trowing up this quick vid I made to help out anyone who is new to using Jacqui. This is my preferred method for Kara Canceling off Jacqui's Hop Kick / F4.
F44, neutral B, for Toe Stomp [Low]
F42, neutral B, for Downward Hammer [Oh]
F44, neutral BF4, Toe Stomp into Gauntlet Strikes...