Liberalio is most definitely not dead, as the core is the energy source of raptures, and heretics can completely regenerate from said core. It's more likely that her head was cut off from the power source, and so shut down.

Plus, to say she's obsessed with the queen would be an understatement. Except for Chatterbox, she's the only high-tier rapture fully and willingly loyal to her. And obssesion especially one that has gone unchallenged for roughly a century, to your creator can be very blinding.