I will admit it. The YAHOOOOO sounds like Peach. And this references to how close Peach and Rosalina truly is. I will love Rosalina all the way even though she would sound like Daisy. Like what Rosalina said:
She won't always be that same person... I can make a story, once upon a Tino...
Rosalina was devasted with all that loneliness and isolation in space. Mario was the shine in her eyes, she now knew where she was meant to be. She was getting more socially active with her Mushroom Kingdom friends, and so on. The more she spent with them, the more she rubs off. She used to be that sorrowful person when Mario first met her, and now she is who she desires to be. An outgoing woman, who is independant, with no help, whatsoever. For now, who she is today, will her past be never forgotten. She will always be motherly, and caring to all her friends, as she had been with her Lumas. We may discover that in the story mode, but one would object it, whom's name I mention before the starting of the story. I mean no harm, hate or love Rosalina, she will continue to stay in the Mushroom Kingdom, and return home every 100th comet. And that is the story of how Rosalina, the mother of Lumas, become who she is today, a socially active woman.
...And thus, ends the story. This isn't meant to be canon but that is how I see Rosalina develops. For all the haters, may the stars rain down on you, and for all the fans, may the stars of passion, truly shine down on you...