Hi everyone. I am new to these boards so firstly hi

I am looking for some advice please regarding our just turned 6 year old child. I am at a loss what to do and thought I would come in here and ask what other mums would do.
My hubby and I have never been away together and have just booked an overseas holiday for 8 nights minus children which we are very excited about.
Problem is our 6 year old frets a lot when seperated from her father. Admittingly she has never been apart from me so I don't know if she would be the same apart from me but her dad works a job that takes him away about 4 times a year and she spends the time fretting for him and crying for him at night.
Now we are wondering if we should consider taking her with us when we go. She would be staying with her grandparents who she loves dearly while we are away and would be with other sibilings as well but Im really worried about what to do.
Its not like we can drop everything and go and pick her up if shes upset as we won't even be in the same country.
What would you do in our situation? I am in two minds as to what to do and its really confusing lol.