DD struggling with DH working away

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DD who is 6 is finding it really tough when DH is working away at the moment. she is very emotional, up one minute down the next, crying for DH, crying about the smallest of things. He can be gone for upto 3 weeks at a time but does also get lots of time at home with us too when he isn't working. He's been in this job for around a year and was in a normal Monday to Friday job before that so it's been a huge change for all of us but she seems to have found it a lot more difficult recently so I'm not sure if this is more an age related thing or something else?
I am a sahm and try to make sure she gets loads of time and attention from me when DH is away but I'm unsure how else I can support her through it really other than being there as much as I can.
has anyone else been through this? How did you help your children cope?

Can you start a scrapbook with her that she shows your husband when he gets back? When she misses him, direct her to do a picture or write him a letter about her day and stick it in (I'm aware at 6 you might have to transcribe her letters underneath but excellent for developing her writing!). Then maybe when your husband comes home, he could take her out for a hot chocolate and they could look through the book together and make it a special daddy-daughter date? It might help her to feel more excitedbabout him coming home rather than sad that he's gone.

@Rora24thats a really lovely idea, thankyou. I will give it a go