Even if, say, a pair of people as completely perfect as Opal and Engel hadn't gotten together on purpose, which they did, it was pretty obvious that they belonged together. However, Juno belongs with her mother, at Aperture, in their destroyed Earth as much as she belongs in any other world where Engel lives. That is to say, everywhere. Juno is very comfortable in clean, neat situations - more so than she is among the rubble and ruins of her mother's homeworld. But she makes the best of everything, and wouldn't think of looking a little distressed (or a lot distressed) if she's feeling ill at ease.
Juno wants to be there, for her mother. She really does. But both of them know she can do far more good in her own element off their world. Zekira, Carramba, the Nexus, all equally open domains for one such as she. Her pale blue eyes see deeply into hearts and minds. Seeing the hurt and anguish of the Humans as well as Vorts left on that Earth pains her. Before she's really going to be of much use there, aside from her crowd control abilities, Juno is far better suited to life on Zekira. Not that that was where her father was from. There's another version of him there. He's more than happy to take up the slack of instruction if it ever lapses on Twoarth, which it hasn't. Not much, anyway.
As a socialite, Juno excelled from the start. As a young child she heard and understood so much more than anyone expected. As a teenager then, her skills at manipulation and information gathering have served her very well indeed - she won't cheat at exams, but she will make sure to expose those who do. Juno is ... not very generous with her time or abilities, she's absolutely cut-throat for doling out what needs to be said to the right ears. But she's rarely content to just withhold information and let things go the way they go - far from it, she'd rather purposefully make it known that she does know something, because she does enjoy people pleading with her for it.
She does have to work on that cruel streak a little. But it cannot be said to have been inherited from either of her parents more than the other - they're both remarkably horrible in their own ways. When Juno is summoned back to Rookery Earth, she will thrive in a position of power, and if she's not in a lofty spot, she will get there. It will never be at the cost of people she trusts or needs to rely on, that she learned from her father explicitly. Betraying trust is something that even Juno is not going to do. So for anyone that gains it, with difficulty, she will not falter in her efforts to keep that trust up.