Why doesn't Rosalina sound like she used to?

Rosalina is the newest Mario princess, and yet her voice has been super inconsistent! Over the course of a handful of years, Rosalina had 3 different voice actors! So why does Nintendo keep changing her voice? Why doesn't this Mario character sound like she used to?!

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SOURCES
https://www.mariowiki.com/The_%27Shro... (Mercedes Rose interview)
https://www.mariowiki.com/Talk:Kerri_... (Kerri Kane interview)
https://www.mariowiki.com/The_%27Shro... (Laura Faye Smith interview)

CREDITS
   • Mercedes Rose Talks About YouTube   (Mercedes Rose Talks About YouTube)
   • Mario Golf World Tour Walkthrough - R...   (Mario Golf World Tour - Rosalina footage)
   • Mario Kart 8 - Star Cup | 150cc (Rosa...   (Mario Kart 8 - Rosalina footage)