Clementine is dying at the end (My theories ALMOST prove it)
Look at the last episode, then look at the lyrics of the song Louis was singing "Oh my darling Clementine"
"Drove she ducklings to the water.
Every morning just at 9.
Hit her foot against a splinter.
Fell into the foaming brine."
(There could be a "splinter" too since there is a bridge near the fishing grounds, of which clem's hat, is on the last episode)
then the next line
"Ruby lips above the water.
Blowing bubbles soft and fine.
But alas I was no swimmer.
So I lost my Clementine"
This could be from AJ's point of view, or the person you make a love interest with's view if you receive an option for a love interest.
And ever since she lost Luke in the lake I think she may have some symptoms of PTSD putting her against water or at least losing someone in it. (Leaving her defenceless in problematic situations with the fishing grounds or other bodies of water)
Sorry to say this because I am angry the series is ending full stop, but all my theories point to clem drowning by the fishing grounds or any other bodies of water, with either AJ there (since he can't swim) or her love interest there since they would be the most likely to call clementine "my clementine"