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[MCU/Jessica Jones] [Spoilers] What did Jessica Jones mean when she...

What did Jessica Jones mean when she shook her head in disagreement when Luke Cage asked her if she was controlled by Kilgrave when she killed Reva? 

That part lost me and it's bugging me whenever I do a rewatch. I don't remember this being addressed at all. 

EDIT: Thanks for the really detailed answers, everyone! It's pretty cool to read this stuff mid re-watch as it adds more depth to the show.
gpt
If memory serves, the bus incident in which she realized she could escape Kilgrave's influence took place immediately after she killed Reva. 

So it may have been just that. She had just broken out of his control and killed Reva due to the habit of obeying him, or more likely she blames herself because if that had happened just a moment earlier, Reva would still be alive.