I think Statham's guilty personally, but I still don't trust Weaver. It's almost impossible to trust what she says at this point. Of course she'd say she's innocent. Or wait,
ugh
thinking
So, if she's mafia in this situation, and she says she came up innocent, and then Statham dies and he's a townie, then Weaver's dead, straight up.
So basically, she's either telling the truth, or she knows she's a goner either way, and wants to take out one townie before she goes.
I have another suspicion, though, but I'm hoping someone else brings it up, because I wouldn't know how to use it to get any information, and it might spoil the effect.