Fourth noncard is silliness. The bubbles are aimed at you when they fire so THEORETICALLY you can stream them. In reality there seems to be no clear consistent way to do this thing. Alternating between v. rapid shooting and streaming has given me a cap rate on it of something like 10%, so basically you just have to bomb it at the right times.
FWIW, due to the way that lives and bombs work, don't bother bombing, just eat the hits, until you get to Last Call, at least on that noncard, as it's very near the end and your timer would typically be close to the end by now anyway. Her next two spellcards are nowhere near as difficult as her fourth noncard either, for that matter.