Ah, I see, so that's how it is! I understand now!

H'aww~... Chi-mat-a (she might've) went and did it...! "yacchimatta" - approx. "I goofed!/I did it, unfortunately!"

Chi-mat-a, Chi-mat-a done it now...! "chimatta" by itself sort of means [verb] was done regrettably, accidentally, or as an unfortunate consequence of something else