There can be various reasons why a girl (or anyone) might suddenly change their Instagram settings to private. Here are some possible reasons:
Privacy Concerns: One of the most common reasons is to protect her personal information and content from being viewed by strangers or people she doesn't know well. By setting her account to private, she can control who can follow her and see her posts.
Unwanted Attention: If she has been receiving unwanted attention, messages, or comments from strangers or people she doesn't want to interact with, she may choose to make her account private to limit such interactions.
Online Harassment: Experiencing online harassment, cyberbullying, or trolling can be a significant reason for switching to a private account, as it can provide a sense of security and reduce the chances of such behavior.
Identity Protection: Some individuals, especially minors, may prefer to have a private account to protect their identity and ensure that only trusted individuals can view their posts.
Personal Content: She might have posted content that she only wants to share with close friends and family, and a private account allows her to have a more exclusive audience.
Change in Circumstances: Life events or changes in circumstances, such as starting a new job, relationship, or personal growth, could lead to a desire for increased privacy.
Social Media Break: Occasionally, people may decide to take a break from public exposure and limit their social media interactions by switching to a private account.
It's essential to remember that everyone's reasons for adjusting their privacy settings may vary. Making an account private is a personal choice, and it's important to respect others' decisions about how they want to use social media platforms. If you know the person well, and you're concerned about the change, the best approach would be to communicate directly and ask if everything is alright or if there's a specific reason for the change. However, be respectful and understanding if they choose not to share the details with you.