I think she would have had at least three bases. UK, US and something like MonteCarlo or Nizza. I wonder if she would have kept up the level of charity work or if she would have slowed down a bit.
In the end, no one here has a really good idea about her to make a reliable prediction. She might have fallen from grace, turned her back to centre stage, have been unable to accept her sinking popularity, went a similar way as Fergie, stayed a glamorous humanitarian, gotten therapy and live happily ever after. She might have gotten sick and died a year later. There are many possibilities how her life might have turned out.