I don't think she's a dissenting voice. She will follow the neo liberal playbook.
To some extent yes. But like the many things DJT has said which have returned to bite him on the ass, Madame Clinton has got a long list of campaign promises that will not be forgotten. Warren and Sanders will certainly not forget them and (among others) will keep her toes to the fire.
A flipped Senate and weakened control of the House would go a long way towards making some of her domestic goals possible.
I noticed several times during the debate when Clinton wanted to use the term "Make America Great Again" and stumbled slightly finding words to replace them.