And Elizabeth receives forgiveness that quickly?  That sounds extremely unrealistic to me...if you were trying to make your characters even remotely human, acceptance would have to be earned and not given freely after the way she treated her son.  It would involve a lot of bitterness to overcome on Edward's side and definitely a lot of therapy.  Especially since he's cited his commitment issues in the past as a product of his abandonment by his mother.  Okay, she was not strong enough to take care of herself and Edward at the time, but she could explained it so Edward did not grow up thinking he was unloved by his own mother.  I would delve deeper into the human psyche to create interactions between your characters thatc ould be transferred to real life situations, something relatable so that your audience gets drawn into the story.  When you decide t edit this fic, maybe think about revamping this scene or taking this part of the plot completely out of the story.  Do not skim over it and give it a happy easy ending because you don't feel like writing it.  If you don't feeling like delving into the issue, do not include it at all.