Why is Elli forced to stay away from the annex?

Elli is forced to stay away from the annex due to the dangers posed by the Nazi regime during World War II. The annex serves as a hiding place for Jews, and Elli's presence could jeopardize the safety of those inside. Additionally, the outside world is increasingly hostile, making it crucial for her to remain hidden to avoid capture. Thus, her absence is a matter of survival for both herself and the people in the annex.