A really good writer, this one. Managed to make possibly the most revolting story arc without turning it into a weightless and silly squickfest (like frankly most of anime and manga does, when it tries to be dark).
She had apparently agreed to this from what we knew. But as things got more effed up I doubt she was okay with it any longer. The uncle must have forced her at that point, and is lying to save his skin
goof in page 36 : snow boy says "there is no phone signal in this mountain" , but previously , in page 30 , tanuki guy called the phone of spider boy just fine .