How can I encourage my girlfriend to be more independent?

I posted a similar question a week or so ago.

She's recently told me she WANTS to be an archaeologist, but is GOING to do dermatology for me. I've said countless times since then that she should do what she's most interested in, but she says she's doing everything for me. That bothers me.

She initially said -- months ago, we've been together for years now -- she plans on doing dermatology. Having kids. Staying in her home state. Now she's uncertain.

When I tell her to do archaeology, she says "No." and wants to change the subject. Should I be as worried as I am?
How can I encourage my girlfriend to be more independent?
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