Welcome to Sober Recovery. What you are going through is really as tough as it comes, but you've come to the right place to start finding answers.
A few thoughts:
I've seen plenty of kiddos in meetings, so just take her with you along with some things to keep her occupied.
Think about what you would do for the next 6 months if he was suddenly incapacitated and you were alone. Plan on him not being there to help. There are ways you could still continue with school, even if it seems impossible, there are lots and lots of women doing it at this very moment. Check around on campus to see what kinds of childcare might be available.
And breathe... you don't have to have all the answers today. The right decisions will come just when necessary.
My prayers will be with you, your daughter and your husband.