she doesn't get why the dollhouse doesn't just kill Ballard

I agree with your mum. Maybe so as not to arouse suspicion? Because people know he's investigating the Dollhouse? So then everybody will just Mulder him to the sidelines?

I have thought that the neighbour (Millie?) was a doll the whole time.

You're smart! I knew something was up with her, but I didn't realize she was a doll until they revealed it. *thumps forehead*

Also it was a bit freaky seeing NotHelo beating up NotRomo :D

I know, right? 8-)