The less time that you've spent in duty, the more likely they will be to not grant it.
Yes, everything is at command discretion and they'll take everything into consideration.
So, you have an ADSO, you're in MI, you have a husband in the military, you'll only have served with them six months. Trying that early would essentially be giving the commander the most reason to not grant it. I'm not saying they won't or can't. I'm just saying that, if I were to be looking for the fact pattern that might make a commander choose not to let you out, trying it 6 months after your first duty station is not ideal.
Having an enlisted husband doesn't help at a lot, unless he is a short manned career field. A commander could refuse your separation request, make you fail to have a family care plan and then see that he is kicked out instead of you. Once one person is not military, you don't need a family care plan, so that would take that off the table.
Simply put, if the commander wants to let you out, he/she can. If the commander wants you retained, that will happen too.