I'm guessing her sudden interest in Silver stems from Silver being one of the most popular VTubers on Fansly, so Kati is trying to get close to the "top dog." Since they're both in Austin, it's easy to initiate hangouts and have her around. Maybe she'll get bored and distance herself in the future once she considers Silver dead weight.
For now, they seem to hang out all the time, which is one of the reasons why she's gone all the time. Not that Kati would go back to her old schedule if Silver wasn't around :COPIUM:, but you get the idea.