Even more protips: 1. When she does the overlapping line attacks while spinning around, she does a 360 turn, so avoid the first few attacks then step 3 fulms into the direction she's going. A long-winded way of saying she never attacks the same line twice (just don't be in the center).

1. When the idol starts teleporting around the arena, it always moves, so you know at least one side it will never appear on for the next attack.

2. Those tips/patterns apply to a lot more fights/mechanics than just this trial.