She hides.
She cries quietly and tries to get her mind in order enough to stop. People here are - not people - maybe people? - weird, and she doesn't have to worry about them thinking less of her for this, and she can just go somewhere else in this general area and tell people the exact truth instead of her inferences about it and then have them corroborate her with perfect confidence and that'll be okay once her people -
- how exactly are her people going to come save her? What if, instead, she never sees any of them again? What if she never even knows whether they won the war?
She has a vague sense that her brother wouldn't be having a breakdown in her place but is that something she can imitate? It would be if she were going home - not that she actually knows she isn't, maybe she still is - is this even real, yep, not a dream - well, she might or might not be going home, people here might or might not actually believe everything...
...although why choose the exact things they said if not? And the reaction to her talking about wanting people to be mistaken about her - that's weird, why not react to it as confessing a shameful desire to do something extremely taboo?
What would someone do who wasn't panicking? Teach the weird honest aliens to lie? Maybe just survive here until she can figure out how she got here and how to get home.
Right. Okay. That sounds like a viable plan. Figure out this place's weird magic and go home and maybe turn out to be able to turn the tide of the war with her new magic. And on an immediate level... well, if she can actually trust that these people really don't care if she steals, fine. She evaluates the nearby foods for easy concealability and checks whether there seems to be anyone looking at her.