We never really know when people leave for good. You may here a whisper or the wind blow. My sister told me when she left this hollow earth that she would always be with me in the shadows of my soul. Crying in the dark night, knowing she had to go. My angel was gone. Now I'm here without you.
She is still with you. When people die they stay with us in more than just memories. They continue to influence us, love us and even communicate with us. Don't worry, she won't leave you.