Quite obvious starting from when Ann was human size that it was a dream. If there were some kinda feature to make Shinki's become human size, then we would've seen more of them. Although, I was not expecting Ann to catch a virus, what kinda lame bastard would want to corrupt little doll like people?
A bit of a shame that even in her dream, she did not get more romantic with her master. However, at least she told him her identity, I would've been really annoyed if she didn't. Too bad her master didn't buy her that dress, she looked really good in it.