Wow, Cirno is so stupid.
Alice's laser and Marisa's stars are both energy, which means they are both waves. The WKB approximation for the tunneling coefficient of a wave incident on a barrier sort of assumes that the barrier itself is physical(or an actual change in the medium the wave is traveling through, which doesn't include another wave), not another wave. Thus, the most that will happen when Alice's laser hits the stars is some wave interference. Depending on the structure of the waves, a few things could happen. The laser could bounce right off of the stars, or could diffract through the stars and split(depending on how far apart the stars were from each other).
Given that Alice's power is currently 4.5, I would go for the diffraction occurring. The laser will split into a certain number of paths, and they may or may not hit Marisa. Considering Alice is tsundere and just wants to give Marisa a hug, and assuming she knows all this, she will purposely get one of the diffracted beams to hit her in order to knock her out for a second so she can advance and give her the hug.
duh.
(note: I don't believe a wave can diffract through another wave. That part was just there for the sake of finishing the problem the wrong way)