If she is just being emotional, calm her down. Enough of asking why she is being emotional. There are things you can reason. There are things you just let be. She is just missing her Daddy.
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When she can’t explain why she feels certain feelings because she is just a child, stop being a professional engineer. All she needs is just a dad to say, “It’s all right.” You’re not constructing world’s longest hanging bridge.
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Just like the two of us, she too, is Work In Progress.
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Questa è Enida 
Aww..poor baby. I know the feeling. It takes sometime to adjust to the situation. My brother fell sick for two weeks missing our dad 34 years ago.
Luv, sedihnya dengar cerita your brother. It does take the toll on children kan. Sebab they don’t know how to express their feelings yet. But you’re right, it takes a while… 😦