Yes. Apparently she's a robot. She didn't know she was a robot. And no one knows when she became a robot. But... she's a robot.

She's also same as she ever was regarding Spike. She says that she's ashamed because people look at her the same way they look at Spike. That if she ran off with him it wouldn't work and would basically be squalid. When someone assumes that Spike is her boyfriend, she gets angry and confronts Spike who tells her that he still loves her. And, of course, she can't respond because her arm is ripped off revealing... she's a robot.

Such is what's left of Joss Whedon and his 'ideas'

And I do think that Zoe was just chilled. She's been perfectly fine since.