She's finally done torturing and killing Lilly and her parents while nobody noticing, she needs to get more desperate and stronger to kill more Malino's, including the 4 of them trying to ruin their career to torture by Eluca.

So she tried to stole Eluca's and Rinny's kill to not waste her time and kills him, Rinny was furious.

The suspect was nobody to be found, the four of the victims were dead, and so was the Dream Terror was dead as well before she's the one.

I remembered that she stole everyone's kills like the other chaotic and lawful evil at the same time.