What is girl says i ll let you know?

When a girl says "I'll let you know," it typically means that she needs more time to consider or make a decision about something. This can be a response to a proposal, a request, or an invitation.

It is important to give the girl the space and time she needs to make her decision. Pushing her for an answer or pressuring her can come across as insensitive and may harm the relationship.

It is also possible that the girl may not be interested, but doesn't want to outright reject the proposal or request. In this case, she may be using a non-committal statement to avoid hurting your feelings.

Ultimately, it is best to respect the girl's response and allow her the time she needs to make a decision. If she chooses not to respond or declines, it is important to accept her decision gracefully and move on.