That’s my number one complaint as well. If they could just polish that cutscene and make it more meaningful, her story/romance would be a lot better. You can have as much wonderful content as you like in the beginning and in the middle, but if it doesn’t finish strong, you’re left with a bad taste in your mouth, really. I’m fine with her not having a “happy ending” and having to suffer to the extent that she has, story-wise, but what is most troubling is the lackluster, emotionally unsatisfying finish. It needs a touch of, “well you went through all of these absolutely horrific things and lost your parents, we’ll get through this together, let’s talk about that future that you wanted to have with me,” or SOMETHING. Something more than “what’s next….?”
The intention of the writers is clearly to get you emotionally invested in that character, so they need a strong, emotionally meaningful finish. I don’t know how the other companion quest endings compare.