This is only a theory of mine. I've thought for the past 4 years that she made a huge strategic mistake. If she was smart about it, she should have retired while Obama was in office, say 2015 or before. But she didn't and then Scalia died so she had to hang in there. She probably figured that it wasn't a problem because she felt, like most of the Dems, that Hillary would win. If Hillary had won, I'm sure that she would have retired in 2017 as soon as they replaced Scalia. But Hillary didn't win, so she was screwed and she's been hanging in there in hopes that Trump will lose in November. She didn't make it long enough.