I think it was right for it to end. I think the relationship has been fully explored and it was good to end it while it still had steam.
I think it may feel rushed because a lot of the critical elements of the final conflict were introduced relatively late: the authoress's angst, the dad, etc. Maybe if they were introduced earlier and stewed for a bit before the end it would have felt smoother?
Nevertheless, solid conclusion imo. I enjoy a peaceful epilogue.