Plot holes with Olivia.

So the timeline is different because of the Peter erase but we learn he's actually with the right team. Olivia becomes the old Olivia from the older timelines and allows it to happen

But what I don't get is how that just dies out. I'm almost at the end and Walter says it's William Bell behind this and how belly died in a car crash.

Olivia seems to have no memory of her time with bell from seasons ago, just as she didn't have memory of helping Nick lane before in the previous time line.

I'm just confused or thinking I'm right in that they're inconsistent with writing Olivia's transformation into who she was before Peter disappeared.