Hi prozspade, welcome to the forum. My guess is your ghost is now a stay-at-home-mom because household members who die and become ghosts don't have jobs. Which makes sense, right. After all if you die you don't stay employed. I know that townies sims who don't have jobs will either be 'unemployed' of 'stay-at-home-parents' if they have children, so that's why she now has that label. If you invite your ghost back into the family you can give her a job again but I think she will start at L9 of her career rather than go back to L10.