Having trouble coming up with a desire for my vampire before session 1..

I've locked everything else down - ambition, touchstones, convictions and all the inbetweens.

Desire is kicking my ass.

I'm going to be playing a Brujah who has a human younger sister who believes her to still be alive, as well as two other human contacts (an old friend, and a journalist mentor). I'm trying to come up with a desire related to one of these that I can reasonably work towards but nothing is resonating. She's been a vampire for around 10 years, and I think maybe I'm having trouble separating the human from the vampire.

For a while, I was settled on having it be to funnel information about corruption to her journalist mentor, but now that we're getting closer to the session 1 it feels maybe a little flat.

If you have any advice on choosing a good desire to start with, or any other related advice that would be SO appreciated!