He is always there to support her in any situation. He trusts her enough to hand over the responsibility of the house to her and accomplish his duty for the nation.
Of course she is scared, but she allays her fears by keeping herself busy with her daily chores. Her soulmate is on the war front, and you remind her of being scared. It is like breaking the strength of the firm pillar holding everything together. She is afraid but she is strong enough to hide it.
The only difference between the two is that the latter will give up her life without water, but the former will live strong (even if they are far away from each other) with the vigor of trust, love, and hope which they build between each other.
If you do not have anything else to say to support her, then it is better to remain silent instead of asking the same question every time you meet her. Don't test her patience.
But you are simply hurting the wife of a soldier by telling her such things. She won't be jealous but will definitely feel bad for her husband being so far from her. Yes your husband loves you a lot, but her husband has a big heart to love her and his duty equally.
There will be times when she will need him by her side, but she can't help it and has to deal with the situation alone. If she shares this with anyone, then she expects a supportive word and not things that might make her feel miserable about her situation.
It can be very difficult to handle the kids when their father is away, but both of them skillfully take care of the situation. After the father leaves, the kids are her responsibility, and she takes care of them perfectly. She keeps the kids close to their father even in his absence.
She being upset for a few days is acceptable, and they should give her time and space to restore her routine. They should not run to help every time they find her shedding tears as she may have to face this situation in the future too.
She has her own job, house and kids to look after. Her husband and marriage are not the only things of her life, there are many other facets to her life.
There may seem to be no end to her tears when she sits in the house all by herself and misses him. There may be times when she suppresses the lump in her throat to keep others strong. She feels like calling him but stops herself because she knows that her husband is on the war front, and she should not make him weak with her emotions.