Looks like they kinda hamfisted one in there for you. Other than some of the VO during that scene, it really felt like something cobbled together in post - I wonder if that was a prevailing sentiment in their focus groups.
It felt to me like about half an episode worth of story that got crammed into a vague investigation interview, then they called Foster back to do a new VO.
Overall I loved it though, that ending montage just felt rushed.
Maybe she’s saying no now because Dark Fate was good enough for her to feel closure on the character. It’s not like she made some specific boundaries twenty years ago about when/how she would return to the franchise and now has to stick to that plan.
I’m convinced that there is around 50% of the general adult population that has zero emotional intelligence and lives in a state of emotional ping pong. Just raw emotional energy that is entirely at the whim of whatever happens to be in their line of sight.