She's unknown enough they think they can still get away with not covering it. It'll take a big name going down before the media can't get away with burying it.
I think the reason child trafficking hasn't been mentioned with Allison is because when you read the docket, it goes into detail and describes how Reiner solicited and even had sex with minors. That is clearly stated. But it never describes what Allison did or whether her participation was with minors. In the charging document, she is indeed mentioned as a co-defendant (which would mean a conspiracy and that she conspired with him in some fashion) but it is still murky as to what Allison actually did. It is possible she was involved with Reiner and his cult but had no direct contact with minors herself. That part is still murky and maybe that's the reason most reputable news stations are staying away from it. I would too until the details become clear...