Why does tally hide her hoverboard while she rests?

The solar cells of her hoverboard could be seen from the air so she hides the board.

One thing was certain: The shiny solar cells of the hoverboard would be obvious from the air. Tally checked the charge; more than half remained thanks to her slow speed and the bright sun now overhead. She unfolded the hoverboard, but only halfway, and hid it among the tallest flowers she could find.