I am working as a tech in the critical care setting to put myself through RN school, and we are even allowed to put in Foleys. However, on the floor, the regular techs can't do catheters, but they can DEFINITELY empty ostomy bags, and I'm pretty sure they can change the bag if needed. That tech is just lazy. I don't think you should confront her about it at all. I do think, though, that each time you work with her you should ask her to empty ostomy bags, change linens, and clean up EVERY code brown you come across. Confronting her won't keep her from talking bad about you. And, if she's gonna talk smack about you, might as well give her a reason to. :)