This is set off-world. A girl is doing interviews to be a babysitter. She gets the job but soon finds herself in danger. I don't remember much but on this world the trees are like shapes and there are spiky geometric things about (if you watched Doctor Strange, that imagery is so on point)
There is a description of women with gaudy kohl on their eyes and what is probably a hijab or baklava although they didn't use the terms. I found that very striking because nobody I knew wore garb from head to toe and nobody revealed the eyes.
What I remember most is that the planet affected her and the boy differently. Her feet would try to burrow into the ground like they were becoming roots and she would feel energy from the earth. I think the boy was always trying to go to sleep, and she thought that sleeping was dangerous. I think she gave him the last of the water...
Apparently there is a whole colony of humans on that abandoned rock. In the end she and some guy she met were fixing up an old space shuttle to fly away from there.