Welcome To BYC.
I'm sorry to hear about your chick. If you have photos you wish to share that would be good.
A leaking yolk sac does not sound too good. Hopefully it will dry up. I would keep her in the incubator, but place her in a paper towel lined coffee cup or shallow butter tub to keep her more "confined" so she's not dragging the yolk sac through the debris on the incubator floor.