Molly Weasley could not think, could not feel. She had lost her son and it affected her so deeply that she wasn't even sure if she was still alive, the numbness making her sure that she could never feel again.
And yet, slowly, feelings came back to her. At first it was just shock, then the sadness seeped its way right to the core of her soul. Once that hit her, everything consumed her all at once: grief, anger, guilt; they all pushed their way into her mind, forcing her body to react with an uncontrollable torrent of tears.
She convinced herself that nothing would ever make them stop.
She would find herself sitting on his bed, not knowing how she got there, or for how long she had been there, just eventually realising that silent tears were running down her cheeks.
The family albums that had always been stacked on shelves now lay about the house so she could open one at any moment and see her Fred smiling and waving at her.
This gave her some small comfort, but it didn't stop the tears and it didn't start the healing process.
No, the thing that started the healing process was her magical clock. She had avoided looking at it, she had hidden it, not wanting to see Fred's hand pointing to nothing or worse, that it may have disappeared entirely.
But, by chance (or perhaps something else), one day she happened to knock the cloth covering off it and even as she tried to stop herself looking, she noticed it.
Fred's hand was not gone or pointing to nothing, it was pointing to a new description that had appeared.
The healing process started that day for Molly Weasley when she saw that Fred's hand was showing her that he was now 'at peace.'