If a Democrat wins in November, I think she's likely to get a cabinet position, or a high ranking DoJ appointment. Depends if she ends up endorsing the eventual nominee at the right time. But bowing out early in December is something that most future Chiefs of Staff will look kindly on her for. What helps her for a cabinet or White House appointed position, too, is that her senate seat is safe in California, which is something that a candidate like Amy Klobochar doesn't have going for her for a WH position down the line.