Any lightning coming out of, or appearing on, her hands, would at that point cause her to react extremely poorly, and there’s simply no footage of her after that point that would fit with that. “I almost electrocuted Finn with the same lightning that blew up a whole damn ship earlier” is too big a deal to go unremarked or un-reflected upon.

In that moment, and that moment only, removed from the context of the rest of the movie it might be “cool” to juice the scene by having lightning show up on her hands or even shoot out of her fingers. But that’s an impulse that again, is too similar to the “throw it in the movie whether it fits or not” ethos that caused the movie to be a pileup of “cool” moments crashing into each other that needed such heavy re-editing by the community in the first place.

It’s a trailer beat - not a storytelling one.