I've played Jacqui since the first week that the game came out, mainly out of spite due to unwarranted community hatred of the character. I found that she fit my rush down style perfectly! Jacqui really is all about mixing up mids and throws. Once she is in, ducking without blocking is not really a good option unless your opponents are godlike at reads. You have lots of ways to get close to the opponent and stay on them. Use the dash punch carefully to close the distance and use f+3,1 or f+2,2 to get in and punish crouching opponents that are baiting throws.
Once trained, you can force them to block so now throwing is on the table. Set up some oki after a knock down with a quick nuetral jump+1 on the way down into b+3,2 into whatever you can combo into if they are cornered. Mix up b+1 with the previous set up. Watch out for quick d+2's while employing this mix up!
Most of all, have fun watching all the quitalities you will see!