[She seemed very mature, if brash, but the adults around her were concerned for her safety and expressed how she should have had a guardian for more of her life. That, and she was in the middle of an Autobot-Decepticon warzone. So, she picked Ultra Magnus to look after her.]

We share the same universe, but not planet. Earth is just another inhabited planet, like those the Ximilia encounters. Whether Cybertronians are friendly or hostile to smaller organic life forms depends on the individual. From what I can see, humans are a constant across all of our homes universes. Odd, since they inhabit only one planet.