No. In should be correct. Since what made Earth isn't only the rock it is. There's the air surrounding it too. If you don't count the air, outer solar system's planets won't even be planets anymore.
It's not her. A parasite living in her head is controlling her to do that.... X(
I'm reminded of a little comic wherein Earth tells the Moon that he's contracted a terminal case of humans. Then a lunar lander pops out, everyone realizes to their horror that humans are contagious, and they implore Mars to run for its life.