If she's really into reading (my boys are, too), then I definitely recommend Spider. We had Ladybug when my oldest was 2-3 years old, and gave my three year old nephew a subscription to it for Christmas. My 2 year old would still be interested in it, but my 4 and 7 year olds would not.
We also enjoy Click, Ask, and Muse, and the original National Geographic.
Thanks, I think we'll do the Spider subscription then.
Which of the ones you just mentioned would you recommend for a five year old then? I think I remember researching last night and some of them were for older kids?