"No", Zoriana is not trying to trade with Val and Alyssa.

"Yes", she is trying to get shared vocabulary.

Alyssa describes this.

"Oh. That's really good, I didn't think we'd have quite that much mutual comprehensibility - I guess 'trade' kind of clear, but 'shared vocabulary', really? Do you understand most of what we're saying?"

"Yes!"

"We came here looking for a bigger world and other people! We're really curious why the vacuum didn't seem to be bothering you."

If she had prepared Light she would cast it. She hasn't. She has a headlamp with Continual Flame. She'll sketch a person with a bubble around them, point to it, and say "Zoriana". …and get out her headlamp in case this raises useful questions.