Well, it's not a secret who CAUSED the damage, no, but it would be secret who FIXED it since she isn't using ice to do that part (though I can't really think of how one could in the first place, other than using tools shaped from ice).
Ugh...!!This sure turns out worse than I thought...Haaa...I did such a terrible thing to Dai-chan...Doing field work in the middle of the night, you sure have a lot of energy.