Grace responds to this revelation by looking all around; her 'swimming', still fast (faster than the average human runs, in fact) has a more...sedate quality, and she makes up for her relative haste by circling Oogway in lazy spirals that keep her on pace with him. She has had a lot of practice doing that.

~Your home must be very beautiful, elder,~ she concludes at last, pulling up in front of the great turtle to float backwards while facing him, the better to not impede his pleasant walk. ~The sailors said this island was a place of great dangers.~

It's not a question, but it's also not not a question. Grace knows the ways of the turtle and the heron.