The weirdest part is that they gave her a Flying Grayson necklace. I remember during the trailers that people had pointed that out and thought she would be with Dick in the game.
Either they are impling that she was in a relationship with Dick (some of the tie-in comics referenced they relationship) before Tim and still uses the necklace or they started production with her being with Dick and scratched the idea for Tim but still kept the necklace.
I really like Arkham Knight, but it's the worst written game of the four Arkhams. It's not a coincidence that Paul Dini is not involved in this one and turned out to be the weakest of the Rocksteady trilogy.