A.F.
My son is only 20 months, but I've constantly thought about this as a possible future situation since before he was born. I would be so torn apart. You have been brave for this long and you probably give your daughter the much needed support that keeps her doing her best. What a wonderful person she must be!
I'm sorry I can't offer any advice on how to deal with the pain. It would be great to find a support group in the area for other moms of soldiers, or maybe you could start one for the area if there isn't one. Just know that your daughter chose to go over there because she is so strong, and she got that from somewhere (meaning you, so stay strong, too!!!).
My prayers are with you and your daughter....