I feel like im getting the ending already. 
Maybe something like:
-The fmc makes up with her bio mom, fix the family with the new dad. 
-Fmc soul leaves the body, leave the original soul back to the body while parting with the old family, giving both family fresh restarts.
-The old family move on. 
The meaning of the story: dont cling to the old sad memories and move on, while accepting and facing the truths?