Maybe she got lost. It's easy for an old lady to lose her way, especially in a busy area near the signal. She might be confused about where to go.
She could be in distress due to financial problems. Perhaps she realized she didn't have enough money for something important while waiting at the signal. It might have been a very emotional moment for her, leading to crying.
You could simply approach her and ask if she is okay. Just showing that you care might make her feel better.
One possible reason could be the loss of a dear friend. Naruto forms deep bonds with his comrades, and if something were to happen to them, like Sasuke leaving again, it would break his heart and make him cry.
One possible reason could be the loss of a teammate. In the dangerous world of RWBY, if one of her close friends were to be seriously injured or die, it would be devastating for Ruby. Another reason might be the pressure she feels as a leader. She has to make tough decisions and carry the weight of her team's success or failure, which could become overwhelming at times.
Another possibility is that she had an argument with a friend. It might not even be Ron. It could be with Harry or another Gryffindor. She's very sensitive about her friendships and any conflict could make her cry.
Perhaps she's being bullied. In the wizarding world, there could be other students who pick on her because she's a 'Mudblood'. This could be really distressing for Hermione, and when Snape finds her crying, he might be conflicted between his general dislike for Gryffindors and his sense of justice.
Perhaps she was hungry and had been waiting for that pizza for a long time. Dropping it means she has to wait even longer to satisfy her hunger, so she's disappointed and cries.
One reason could be failure. For example, if she fails in a magic experiment that she has been working hard on, it might lead to her crying as she is often very dedicated to her studies and magic practice.
It could also be due to a hereditary disease. Some genetic disorders can cause blindness over time. The rich old lady might have inherited this from her family. This would change her life drastically as she is used to a life of luxury but now has to deal with the challenges of blindness, such as relying on others for daily tasks and adjusting to a world without visual cues.
It could be that the old lady has some old - fashioned ideas about sharing life experiences, including some inappropriate ones, without realizing the inappropriateness. She might have thought it was a normal part of sharing wisdom from her own life.
One possible reason could be unrequited love. In the fanfic, Chansung might be in love with someone who doesn't feel the same way. This could lead to a deep sense of sadness and cause him to cry. For example, he might have confessed his feelings but been rejected, leaving him heartbroken.