I think the cover had the female protagonist, standing, facing towards the front, maybe slightly turned as if to look back.
All I really remember is that she makes friends with one of the aliens because she lives or lands on their planet, and I don't remember any significant plot points. I think that she is lonely, or the alien is lonely, and that's why they become friends, like it's sort of her becoming comfortable with her new life? I truly cannot remember if there was any evil alien conflict. I think the aliens were either color changing, telepathic/empathic, or had something funky going on with their eyes. I can't remember if the alien was sexless or male, but it was definitely not female. The book was also old at the time I read it (around 2010-2013), so the artwork might give some clues to its age.
The cover artwork could've been anywhere from the '70s to the late '90s, and was in color. It was a chapter book, but not very long (less than or equal to 200 pages).