Provide an enriched environment for your child. Give her access to art supplies, blocks, puzzles, musical instruments and dress-up clothes at home. These supplies increase logical thinking and gross- and fine-motor skills. Dress up clothes encourage a child to participate in pretend play, increasing her creativity and imaginative thinking. When you participate in the fun and games with your child, you help to further develop her vocabulary and build her self-confidence.
One of the downsides to preschool is that the set-up is structured and focused on academics. The research is out: play is the most important thing. Your job during your child's early years is to set the foundation for academics and future learning, so do everything you can to promote playfulness. Take your child outside and let him get dirty in the sandbox while he sorts rocks and build castles. Put a raincoat on your little girl and let her jump in puddles as she walks down the street. Expose your child to as much unstructured fun as you possibly can.
Read, read, read. Read all different types of books as often as your child will let you. Not only will the variety of books you select increase your child's knowledge and vocabulary, but the act of cuddling up and reading a book together promotes bonding and builds a child's self-confidence. Encourage appreciation for reading by taking your child to the library for story time and allowing him to check out books of his choice, or give him special books for birthday presents.
Include your child in on your daily activities. Let your child help you as you cook dinner (she can learn math from helping you measure ingredients). The act of planting a garden or grocery shopping together can be extremely stimulating and educational for a young child. Talk to her as much as possible about what you are doing and allow her to ask questions. Your child will pick up and learn so many different things from playing in your real kitchen or with your real tools, rather than playing with a pretend kitchen or tools.
Trust that you have made the right choice for your child. In a few days of being home with you, your child may have been exposed to a variety of places, activities and people rather than being confined to the artificial environment of a classroom. She will be involved in the rigors of the academic world soon enough--allow her to enjoy her childhood.