It's possible that the content of the Howler conflicted with Mrs. Weasley's expectations or values for Hermione, causing her distress and resulting in tears. Another reason could be that it brought up past issues or tensions that were unresolved and finally boiled over.
It could be that Hermione's Howler contained something really hurtful or embarrassing that made Mrs. Weasley emotional and shed tears.
Hermione could be very hurt. She respects Mrs Weasley a great deal, and to receive such an angry message from her would be a big blow. So she might cry and isolate herself for a while to think about what she did wrong and how to make it right.
Maybe Hermione made a decision regarding Ron that Mrs Weasley didn't approve of. For example, if she rejected Ron's marriage proposal in a rather harsh way, Mrs Weasley, who was very fond of Hermione as a potential daughter - in - law, could be extremely disappointed and angry.
One possible fanfiction idea could be that Molly's howler in Harry Potter was actually a warning not just to Ron, but also a veiled threat to a dark wizard who was secretly infiltrating Hogwarts. Maybe this dark wizard had a plan to use Ron as a pawn, and Molly sensed it through her motherly instincts and magical awareness. So the howler was her way of sending a message to both Ron and the hidden enemy.
In a fanfiction, the howler could have had a physical form beyond just a shrieking letter. It could be that when it arrived at Hogwarts, it took on the form of Molly herself for a brief moment. She could have given Ron a stern look and a lecture in person (sort of) before disappearing again. This would add a whole new level of drama and magic to the concept of the howler in the Harry Potter universe.
There are various types. Some might focus on the emotional impact of the Howler on their relationship. Others could explore the mystery or adventure that ensues from it.
Well, it's hard to say exactly without reading it. But it could involve a dramatic event or conflict related to the Weasleys and the concept of a 'howler' might play a significant role in driving the story forward. Maybe it's a story of secrets being revealed or intense emotions being expressed through the howler.
There's also a chance that she'll be hurt. Mrs. Weasley has a big heart and Harry ignoring her could really wound her. She might then become more withdrawn herself, focusing on taking care of her own family and leaving Harry to his own devices, while still secretly hoping he'll come around.
Mrs. Weasley could get a bit angry too. She has a temper, and if she feels that Harry is being disrespectful by ignoring her, she might scold him a bit. However, her anger would come from a place of love and concern. She just wants Harry to be okay and part of the family, and his ignoring her goes against that.
Perhaps Harry is feeling a sense of guilt or shame. Maybe he's made a mistake that he doesn't want Mrs. Weasley to find out about, like using a dark spell in a moment of desperation during a battle. So, to avoid her motherly scrutiny, he starts to ignore her. He might be afraid that if she gets too close, she'll figure out what he's done and be disappointed in him.