That’s my read too, Sherlock. Rey is totally caught up in her anger, reacting blindly. It’s too much to throw actual lightning around, but a few stray bits on her hand would be totally in character for her at this point in the story and lead organically from her destruction of the transport. There’s actually a lot of emphasis on her hand in this scene, as she shakes it as if it’s paining her, grabbing Kylo’s saber with it to deal the injurious blow, and using it to heal him when she finally realizes how close she was to the darkness. The scene even ends with dialogue about her taking Ben’s hand! It’s actually stranger that there’s no reference to Force lightning in this scene, given how important it was earlier.

Finally, it is absolutely a storytelling beat to tie her abilities visually to Palpatine’s abilities as they have been seen so far in the film.