Changing an obsession for a teen w/ASD+ADHD?

[NJStrong]

How can I help my 15yo teen shift her current obsession from something that is borderline inappropriate to something more appropriate? She has been obsessed with a TV show that has very adult and inappropriate themes for months. She denies ever even watching the show, but explores Reddit threads, creates fanfiction with the characters, and draws them obsessively. Her previous obsessions have been age-appropriate (fictional characters - Harry Potter, Percy Jackson, etc), but this one is not. It's starting to damage her - very tenuous - friendships and is a problem for me.

How can I redirect her to something more appropriate?

[Onthemove1971]

One of the things that really helped our son was finding something ( an activity) he really loves to do. When he was young he did TaeKwanDo and now he plays a team sport. Our son is now loving golf.

Could you have her start to explore things other than school: arts classes cooking classes and physical activity, etc.

Kinda ignore the obsession and find something else to occupy her time.

This could also lead into a career ( don't tell her that) and you could talk about college and things to do on her resume/college application/ job in the future.

[imworrie]

What show?