Kasi's 'clientele' are all depraved people with images to keep up, so she never feels bad. They pay her for her silence, which she is more than happy to provide. Her abilities make very easy to continue stalking them and collect more 'incentive.' They all know if she goes down, someone she works with would immediately publish all of their dirt. Its just good business.
When Lan goes missing, she puts it all on hold to find her. I mean, what's the point of having these skills if she can't use them to help someone?
Not to ship my own characters but I think the love she has for Lan borders on romantic she just needs a push.

The reason I wanna archive so much of my old stuff is for characters like her, cause she was just a Snapchat gijinka but she's really fun for me to draw