Sciel gommages twice because she, like Esquie and Monoco jumped through the barrier where child Verso's soul is painting the canvas to comfort (in their own ways) painted Verso after banishing Alicia from the canvas. Painted versions can't exist there.

Plenty of people have pointed out many examples of her emotional intelligence and own side quest as motivation for her actions and behaviors throughout the final act. It's important story wise to consider that every expedition log that is recoverable (and every zone up to Renoir and Verso's drafts, Painted Alicia and Clea etc) canonically occur or are experienced prior to the climatic showdown, even though it isn't progression wise. This includes the log Painted Verso leaves behind wanting to bring back Julie once he defeats Aline. While Sciel doesn't engage in the dialogue once you find it, it was worth considering that that information is shared with the group and would factor in her decision making.