Hills Like White Elephants - Quote and its symbolism

"They don't really look like white elephants. I just meant the coloring of their skin through the trees."

This quote personally got my attention. If we turn back the page she clearly stated that the hills were so curvy and bright that they turn out to be like elephants, white ones. So then she says in this quote that they don't really look like white elephants. But she said something about their coloring of their skin through the trees. Maybe the fact that "through the trees" takes place in a dry and brownish land means that she just sees how bright they truly are only when she looks at the hills, thanks to these trees that could symbolize the happiness in the desert place in this short story.