I just visited the web site for Sally Ride Science, an excellent resource for science education. Sally Ride is a Ph.D. physicist and of course also a former NASA astronaut who was the first American woman in space. Since leaving NASA, she has been a strong advocate for improvements in science education, and has written several children's books on space exploration in addition to starting her company (Sally Ride Science), which develops programs, publishes books, and sponsors science festivals and science camps for girls.
There is of course a need to encourage all young people to have an interest in science and math, but it is especially important for girls, who often succumb to stereotypes and shy away from technical subjects and careers once they reach adolescence. Sally Ride Science has an excellent PDF booklet for parents on encouraging your daughter's interests in math, science, and technology. This free 22 page booklet is a quick read with a lot of good ideas.