You'll have to not go down the corruption path with the Cafe. Then you'll be able to run into her in a walk around event.
Thanks for the Reply, but I have zero Corruption (I choose scream, like always) ,it still zero when I first introduced to kate and it still zero when I hit day 21. but I'll try again.
EDIT : i've played it Again till day 50, no Corrupt path and 0 Corruption from start to end. I did get the groped by Kate CG and her text messenges. but I never encounter her in walk around event. This is my 4th attempt. maybe I'll try again in upcoming version.
Kate is the best Gurl btw.