Comforting child

How can I comfort my four year old daughter who is having a really hard time with her dad gone? He has been gone for a couple weeks and each days seems harder for her. Before he left we got her a build a bear with his voice saying he loves her, but each day she cries about wanting him home. I told her he was going to Superman Camp before he left and after he left. She just kept saying she was proud of him. I tell her everyday that her daddy misses her and loves her so much, but I don’t think it’s working. I don’t know if it’s because so much is going on (she knows I’m pregnant and that we are moving soon) or if it’s just because her dad is gone... what can I do?