Caught. Well. She can't really hide that she hates him, can she?

"The short of it is that he's a criminal and I'm a detective. The long of it is that he introduced a new drug into the city of Zaun, poisoning its people for profit. His gang has been smuggling that drug into my home, Piltover, and has also engaged in terrorist attacks that have killed civilians."

That about sums it up. She's not exactly proud of Piltover's near colonialist hold over Zaun, but according to all her information Silco has done far, far worse.