Hmm, now I may the exact opposite as you (ENFP), but I'll give forth my best ideas. So, you're worried she has no real goals and that doesn't sound like optimal marriage material for you... well has she given you any definite sign she wants to be lazy and not pursue any kind of career? Or is it a career you feel won't earn her much in life? Is she working fast food or as a cashier somewhere and that doesn't bother her but it does you? Or is she just jobless and out of school and not in any hurry to push forth? I feel if she is at least earning SOME money you shouldn't fall too hard off of you're chair yet.
Maybe if you just slowly start doing little thing to encourage her? Do you have any idea what she may eventually want to strive for? Ever asked her what kind of career she would dream of being in? Now, if she's a person who dreams of not being any kind of career, then you've lost me in the help department,

Still if there is love, I'd try to be as supportive of her as I could. Support from others helps me get where I'm going. (but then again, that's me.)