work, brain! please?

I'm quickly regretting taking on this idea to write a story focusing on Saki if she'd lived. On the one hand, the difficulty in writing is part of the fun, but on the other... I'M SO STUCK! I've got some basic stuff -like battle stance, Personas, and plans for what her issues and development are- down, but there isn't near enough to even get a rough draft going. This girl's life is depressing, I can't get into the right mindset to write it the way it probably needs to be.