What about talking to this girl about great stuff women in her own family/neighbourhood do? Hearing about Marie Curie is great, but a bit out of reach for most of us.....Point out how much fun you can have and how strong you can be using examples of women she knows. Your own cycling feats maybe? If it was my own family, I would give the following examples for starters:

Mom - PhD and full professor and successful career taking her all over the world (That would be Bikeless in WI)
Aunt - cycled the AidsRide twice! I'm scared at the thought of doing it once! And she has a black belt in Aikido (I think) (And this would be Trek420)
Grandma - civil rights and peace activist, arrested for civil disobedience at the age of...not sure....mid 70's? (and she bakes wonderful pies!) (Bikeless and Trek's mom)

Who said you had to be bored and whipmy as a girl? Go out and do what you like! If it's not fun? Do something else!