Go to Celica's home and call Nel.
The next time you meet Glace, you can call Nel for help.
If you are fighting Glace as Celica, the Frost-Guard outfit will dispel her freeze attack.
Or if you can fight her as Candy, where she has a powerful move that can deal massive damage regardless of what her level is.
The Town of Magic guide says that I’m supposed to lose and have my body stolen during my first encounter with Grace, right?
So I tried it and let her beat me. But when my HP reached 2, she suddenly stopped dealing damage. She kept trying to attack me, but I took no damage. Because of that, I had to wait for the freezing effect to end.
But as soon as I got free, she froze me again. The same thing happened when I tried to beat her instead.
This kept repeating for hours, and I couldn’t progress.
And am I supposed not to wear violet when I first met Glace?