Take her to a museum or aquarium or even a zoo. Call the education department of any museum. They often have outreach programs, internships and are willing to give specific advice. Become involved in science yourself. Read a science book, watch a video tape or science TV program relating to the subject.
Children often imitate adult behavior.
You can create a positive role model. Have your child do some simple science experiments. Remember for success, use a model that goes from very simple to complex. Use instructional material that your child can relate to. Every day life examples are most helpful.