Probably is. Aside from her having MC's number out of nowhere (where else besides the cult could she even get it? She doesn't really talk to any of Red's toys.), there was something else I kinda noticed, if I remember right. We know some weird sex-related drugs are involved and probably birthed Red and made MC rather large. But whenever Red gets hyper-aggressive near the start of his corrupting the girls, they all seem a little receptive despite everything. She....kinda wasn't. She'd giggle a little and flirt, but not much else. If she was involved in the cult, they probably have some other kind of drug to counter the aphrodisiac like affect Red seems to have. Plus, remember how MC got close to her to begin with? Some guy was trying to attack her behind the club and he saves the day....but later, we learn that she always has guards around. How convenient they weren't there all of a sudden. Allows her to get close to the MC and no one's the wiser, and pre-Red, she blew him off all the damn time like he didn't exist. She probably just didn't have an opening or the go-ahead from her higher ups to get involved once Red starting conquering everything with a pulse. She probably realized what was going on, and since his dad was involved a while back, put two and two together. Plus, if I remember right, there were a couple times Roger was trying to get with her and she told him to get lost. The others that told him off made him get real nasty, but he stepped back with little incident. He probably knows she's involved and if he crosses a line, he's utterly fucked. Then there's Tiffany. She tells you that she knew Stacy a while back and they were in the band together, but they left on bad terms and accused Stacy of stealing her songs and shit. He's known Tiffany since they were kids, I don't see why she'd lie about something like that. Lying about the drugs and cam shows I can see, but nothing as meh as 'she stole the songs I wrote'. Guess we'll see how it plays out.
Some of my theories about who the cultist is that greets Mc and Pirshila at the gate of the mansion. :
