6x23 Quentin Lance Death

Theory
It has been revealed that in episode 23 of season 6, otherwise known as "Life Sentence", we will see Sara Lance, otherwise known as White Canary. This made people think why that could be. A lot of people think that this is to help Team Arrow fight Ricardo Diaz, otherwise known as The Dragon. But I think it's because of Quentin Lance's death.

Death
Quentin is most likely to die by Ricardo's hand. That's because when Quentin betrayed Damien Darhk, Damien killed Laurel Lance, otherwise known as Black Canary, just to get revenge on Quentin. Now, since Laurel Lance, otherwise known as Black Siren, betrayed Ricardo, Ricardo is most likely to kill Quentin to get revenge on her or Quentin might take a bullet for Laurel. Sara will then probably come into the hospital and only appear for a very small scene where she recieves the news of his death and cries. That will probably be last we see of her in this episode and if not there will probably be another scene where Sara talks to Laurel.

Verdict
In episode 23 of season 6, otherwise known as "Life Sentence", Sara came to the hospital to recieve the news of her father's death. Which hereby confirms my theory.