Seventeen years after Anna Nicole Smith’s death, her beloved daughter Dannielynn Birkhead—who just turned 18— is incredibly well adjusted, says dad Larry Birkhead: “She’s a good kid.” Perhaps it’s fitting that Dannielynn Birkhead loves rollercoasters when you consider the tedious climbs and sharp descents that marked her first year of life.  There was the untimely passing of half-brother Daniel Smith, who overdosed…