There are so many potential stories behind Maggie cutting her hair. It could be that she was involved in a play or a performance where she needed to have a different look, so she cut her hair for that role. Maybe she was in a place where the climate was really hot and long hair was just too uncomfortable, so she opted for a shorter cut. It could also be that she just wanted to make a statement, to show that she is an independent and bold person who isn't afraid to make a drastic change to her appearance.
Perhaps Maggie cuts her hair on a whim. She wakes up one morning, looks in the mirror, and decides right then and there that she needs a change. So she grabs a pair of scissors and just goes for it.
The wife's reaction could have been complex. Initially, she may have been stunned into silence. As she processed what had happened, if she was a more easy - going person, she might have tried to laugh it off as a silly mistake. But if she was attached to her long hair, for instance, and had plans for it like keeping it long for a special occasion, she would likely be extremely disappointed and hurt. She might also feel a sense of betrayal if she thought her husband should have known better than to touch her hair without asking. There could be long - term effects on their relationship depending on how she ultimately reacted and how he responded to her reaction.
There was a woman who worked in a very conservative corporate environment. She always had long hair but one day she cut it short. At first, her colleagues were a bit surprised. But she did it because she was tired of conforming to the traditional look. She found that her short hair made her stand out in a positive way. She started getting more recognition at work for her ideas rather than just her appearance, and she inspired other women in the office to be more true to themselves.
One possible reason could be a symbol of a new beginning. Maybe she's had a major life change, like starting a new chapter in her relationship or in her studies at Hogwarts. It could also be a sign of rebellion against the traditional image others have of her. In some fanfictions, she might cut her hair to fit in with a different group or to show that she's breaking free from her old self.
It could be a story of self-transformation and finding new love. Maybe the girl cutting her hair symbolizes a fresh start and catches the attention of a special someone.
It might change her relationship with Ron. He could be initially shocked but then grow to like the new look, seeing it as a sign of Hermione's independence. Or it could cause some tension if he preferred her old look.