Yin-serpent was previously quoted in https://fstdt.com/QLRSXH.JG5RC7, where she called for the same sentence for a father who stopped his five-year-old daughter's rape and ended up killing the rapist.
She probably does think the officers who shot Blake should get life behind bars. Most of her Tumblr is composed of reblogs of left-wing users.
What her quotes show is that she opposes lethal force even in self-defense or defense of others. She even demands other people sacrifice themselves so her worldview isn't invalidated.
Also, as of this date, Jacob Blake is still alive, though paralyzed.