K.P.
Read to them each and every night. There is not an expectation that children are reading entering Kindergarten. The fact that she has solified her literacy readiness skills is fantastic!
I would strongly suggest that you call your local library. Many of them run summer reading programs that are wonderful. They are incentive-based and encourage children to maintain their skills over the summer. The librarian will also help you and your children find books that are interesting and at their level!