I'm sympathetic to your argument but actually none of this matters. Whether you had it just as bad as her and yet managed to not horrifically kill someone. Whether adults failed her. Whether she dehydrated herself to sabotage her death sentence. Whether she had brain damage. Whether she suffered or didn't suffer in prison. Whether it would be better for her to die because of her intense suffering, or because her victim's mother desperately wants it, or because individuals want her to suffer even more before she finally dies.
What matters is that most humans and most societies, when they really see what the death penalty entails, they don't want it. Even war-torn countries like CAR and Chad have abolished the DP. People don't want it because it reflects a base human reflex to seek vengeance and retribution, which - if it is allowed to run amok - will destroy communities, kill and brutalise innocents, ruin infrastructure and stability, perpetuate violence, and undermine the moral authority of the state.
Most of all, embracing the DP in ANY circumstances debases and violates our collective humanity. THIS is why three-quarters of countries in the world have abolished the DP in law or practice.
The details of the Christa Pike case are actually not relevant to the central issue, which is that the death penalty is an abomination that civilised societies reject.
We're only focusing on Christa Pike because execution of the death penalty in her case was horribly botched in a way that graphically illuminated the barbarism of DP for all to see.
Individuals here on this thread today have shown quite some bloodlust.
I certainly sympathise with the ones who are afraid that horrendous people will be freed by a careless state to repeat their heinous acts. But in this case, the answer is not the DP, it's that we keep pressure on the system and make sure that it is properly funded and supported.
Others here want vengeance, retribution, for Pike to suffer, for her to be tortured even more. I want NO part of this. I do NOT condone this mentality whatsoever. I do NOT agree to people to be tortured and murdered in my name.
Everyone suffers if this vicious instinct for violent retribution is allowed to flourish. I don't want my kids to grow up in that world, because NO ONE is safe then.