She may be autistic, but it is pretty clear that she did know this whole thing was absolutely nuts, as per her own admission. She was aware that it was something to be kept on the low and that it would be damning if it were to spill into her life. Sure, her obsession with Chris was completely retarded, but she was actually aware of this too. So the question now is, to what extent was she a clueless victim as opposed to a willing, if maybe slightly slow on the uptake, participant in this mess?
I certainly wouldn't want to ascribe intent, but the idea that she is only tangentially involved in this mess seems more far-fetched now than it did yesterday.