If you get hit by the burst, the block trap is over. You can delay wakeup, techroll, wakeup fast with a normal etc to try to get out.
I don't think 114~db2 is gauranteed in the corner. Midscreen it works on a few characters because of the knockback distance.
She doesn't have jailing 50/50 run cancels. She has an overhead that jails into a mid/high.
It's not an infinite because she runs out of her level 1 buff eventually. Trust me, it's not easy to put people in this trap. I've tried it many times and when it works you might get 20-30% out of it. You usually have to sacrifice damage in order to get a buff activated. Once you do activate, you just handed all your plus frames over to the opponent, so you will never get a full 12 seconds of f12~QB. You will probably not even put them in the trap because usually they have meter to get out, which takes no timing at all and results in a full combo for them.
In the rare chance that you activate buff, put them in the trap and they have no meter to get out, you are basically guaranteed only 12-15% damage, maybe more. It looks better on paper than it is in practice.