Books often tell you about ideal state. Can 9 month+ babies go without night feeds, yes many can in ideal conditions.
A sick baby, a baby having a growth spurt, a baby who has had to deal with lots if change or baby that is not eating enough during the day will more likely want a night feed. If you can rule those things out you can try reducing amount offered at night as you mentioned, just be sure to offer that extra amount during the day.
Is she upset for those 2 h at night?