That's not really true. She definitely has options to go for a mixup, and stay in your face even if it fails. On example is the corner j.hp burst bait. If they are mashing, they burst and die. If they don't and try to roll, they burst and die (if you didn't use a OTG already). If they don't burst and don't roll, you get to do whatever you want to them. There's other things she can do to apply a mixup and either go for a second one directly after or keep the pressure on.
Meh, burst baits aren't really a proving point to me. Most of them aren't real mix-ups, more like "stop mashing and stay where i want you" flashing signs. Sure, that way you have a perfect opportunity for a mix up...one opportunity. Burst baits, slide into safe jump set-up and all that stuff are "on hit" techs to get a guaranteed mix up. What I mean is, you get the mix up, fine, you try to grab, he jumps, back to neutral, or you c.lk, and you get pushblocked. You had the opportunity, but you still get only one if you fail to make the right decision.
From my match experience against zeknife, either I stay in or get pushed back too far for pressure or mix up to go on is some kind of weird 50/50. I can try to stop either after c.lk or c.mp, and every time I get "late pushblocked", because he sees that I stopped hitting buttons and still have time to hit 2P before the end of the blockstun ; or I keep going for normals and get pushblocked at the end of the string ; or I delay one of my normals, so that when he pushblcoks thinking I'm ending my string, I stay in his face, but if my c.lk actually hits, I end up with a c.mp on guard like an idiot.
So, at the end of the day, it still feels like pressure just vanish after half a second, you either did it and are currently combo-ing, or you're just back to neutral.
Well, against pushblock, I usually do c.lk, c.mp, c.hk. Most people after they push you away will try and jump after you or jump away, or walk forward. People usually don't think to crouch block. Hit them with the sweep and then Tumble Run after them as they tech roll, stop before they get up, and you should be close enough to land MGR while being plus still. And if they start crouch blocking the c.hk, that means they aren't doing anything but holding downback, so you can start doing run instead of c.hk. If you feel confident you can run into showstopper, but you could play it safe and runstop.
C.hk tumble run doesn't sound like a miracle solution to me either, most people I tried that against just pushblock crouchblock/absolute guard, then, as this leaves me rarely at more than +0, they just counter me with faster normals, or jump IAD and stuff...
(Sorry for the possible lack of constructive posting on my part, not having the opportunity to try out anything by myself in more than 3 days in a row got me pissed...but I still try to write down something not completely stupid)