Jessica and Rachel's friendship. The fact that Rachel still stayed friends with Jess despite the rumors that were spread by Tess.
After finally finding out the fate of his Mother in "Loose Ends", Abbey has a complete emotional breakdown at his mother's grave. Without a word, Daisy wraps her arms around him, and holds him while he cries, and wordlessly comforts him in the car on the way home. Doubles as a Tear Jerker.