I beat Fallout 3 yesterday, but I've still only visited about 30% of the map.
I assume you have to have good karma for her to approach you, because I've spent a lot of time everywhere in the Citadel and no one has ever approached me.
She served as nothing but a meat shield for me I always hate having a party with me they always get in the way. So as soon as I decide to make some cars blow up to kill some of the Enclave guess where she's at? BOOOOOOOOOOOOMMM Thanks for the repair materials and ammo meat shield lady.