Not many would go nc with their parents for something like this.
Which leads you to the potential for a personal truth not always being the unvarnished truth.
None of us can climb inside the OP's head, watch a video of events from start to finish and know exactly what happened, who's fault it is and where the hope of resolution may lie.
But, the group of estranged parents who tend to stay estranged are those who present a context for estrangement that makes it look like the child became estranged from them for reasons not many would go NC for. There's a debate to be had over wether the parents genuinely believe their actions are above reproach. Or, in fact they are aware that their version of events is one that is almost impossibly flattering of them, as the victims of an inexplicable descsion to cut ties.
By and large that narrative stands out from the crowd. Parents who can point to earlier patterns of self-destructive or troubled behaviours in their child, who go round in circles trying to pin point their mistakes and how they could have handled things differently... they tend to feature quite a lot in the group that can arrive at some sort of reconciliation.
But not the former group. Because with every retelling the narrative becomes more engrained, more fixed, more something you can't walk yourself back from. And the child loses a little more hope that another go on the merry-go-round of staying in touch could avoid leading to old wounds getting the same shaped new ones on top.
The above might not be the case for the OP. Like I said, not all hooves are horses, it is sometimes a zebra.
But her post hit every note of the style and form of the group who tend to stay estranged in large part because the parents don't believe, or won't accept they did anything wrong. Let alone gravely wrong. If somebody refuses to take responsibility, or even be relatively truthful about their part in the ice descending, it can't melt. No matter how much you want your mum and dad back, no matter how much you need them them to be the parents they could have been, no matter how much you miss them, no matter how much you still love them. Cos nobody ever melted ice by turing the temp down even further with much less truthiness than was needed.
I feel for the OP be she horse, or zebra. I feel for all of them. I wouldn't wish this on anybody.