A woman grows up in an inner room, and no one knows what she means. What does this mean?

There is a girl who just grew up next door. Pregnant in the inner room, no one knows her is an ancient poem, which means: the girl next door has just grown up and has been kept in the boudoir, and people have never seen her. This sentence is usually used to describe a woman who has grown up but has not been known or understood by the outside world.