There is also the possibility that your daughter's kindergarten will really be a "mini" first grade stressing academics. In this case, your daughter's skills will make it easier for her to handle the work.
Remember, in even the most academic kindergartens, time is not just spent on acquiring pre-reading and math skills. Your daughter will be busy with music, art, literature, and play activities. She'll also be learning how to get along with other children and the teacher, to pay attention, to stick with a task, and to function in the school environment. At the same time, your child will be improving her speaking, listening, observation, and fine and gross motor skills.
The many activities of a kindergarten classroom should keep your child from being bored. Don't even suggest to her that boredom is a possibility -- it could be a self-fulfilling prophecy. Instead, emphasize how much she will enjoy all the different activities in kindergarten along with making new friends.
Kindergarten teachers are used to having children with a wide range of abilities in their classes. Hopefully, your child's teacher will provide the appropriate activities to meet the needs of each child in the classroom. If certain academic tasks are not challenging your daughter, the teacher should be able to provide enriched ones that will.