By the sounds of it she was giving a sprint deadline, that deadline wasn't met. Now the priorities have changed, no one except Frontier know why, and they need to resource it. The AI in the game isn't broken, it needs improved and that can come later when there is more time to do it.
She's been moved on to another backlog. Either due to a speciality they need, or simply the number of points assigned need a certain resource pool to achieve.
I'm sure her branch is committed somewhere, and when they have time they can choose to merge in master and fix anything left to do.
Beyond that, there is no further use speculating - and no gnashing and wailing of teeth is going to change these facts. And the more it goes on, the more it exposes the lack of any maturity in this community.