Her new training rink, Pickwick, is about a 30-minute drive from her home.
"I hope this is the answer for Mirai," Carroll said. "What we all want is what is best for this kid."
Everyone does, because Nagasu has one of the most delightful personalties in the sport.
She is funny, unafraid to say whatever comes into head, self-critical to a fault, part ditzy teenager and part insightful young woman. This is what she told me about being the only child of Japanese-American parents who emphasize the traditional values of their Asian upbringing:
"Because I have been raised by Asian parents in an American culture, I struggle a little bit with balancing the two," she said.
"Sometimes my parents want to push me harder and want me to work harder. They will say something is not good enough, and it gets into my mind that it is not good enough, and it does bother me. But my emotions also make me the passionate skater I am."
That passion was completely missing at January's U.S. Championships, when Nagasu clearly was going through the motions.
Something had to change.
For better or for worse, it did.