In the Coils of the Snake (The Hollow Kingdom #3)

the long version

Miranda is finally in the goblin kingdom where she has always wanted to be, but she never imagined she would feel so lost. Her beloved Marak, the center of her world since childhood, has reached the end of his long reign. But Marak raised Miranda to be brave, intelligent, and proud -- the ideal woman to take her place beside the new goblin King. Then a mysterious and highly magical elf lord reignites the age-old battle between goblins and elves. Caught between two hostile rulers, Miranda becomes their greatest reason for war -- and their only hope for a future.