i don't know if this is a xbox only glitch or every where but caits quest to get her unaddicted to pyco dosn't show up for me dose anyone know how to fix this it is the only thing i can't stand

Is your relationship level high enough with her?

Yeah you can't be nice around her. Ask for more caps, do some drugs. Do some drinking. ... ... Walk around naked.

Yeah, you have to get her to like you enough for her to start the quest. You'll know when it's coming when she starts opening up about how the drug is slowly killing her. I've found that when she engages you in the conversations about her past, being nice and supportive to her makes her feel more comfortable around you.