I’m so sorry, this sounds incredibly difficult for you and your dd. Obviously, it’s incredibly difficult to say, but given how ill he’s been, it’s likely that he won’t live as long as he would have if he had been healthy and well and not drinking. How long that might be is anyone’s guess, but oesophageal varices in particular is quite dangerous.
What sort of relationship do you have with him or people close to him? I would really try to find a way to sit down with him and have a really honest talk about what to expect and his prognosis going forward, making if very clear that you want to be able to support your dd through her worries about him, and in order to do that, you really need to know what to prepare her for.
My dad died quite suddenly when I was a teenager and no one really prepared me or was honest with me about the fact he was dying. Everyone sort of kept up the charade that he was going to get better, and then one day, he just went into a coma and died the next day. Family thought they were protecting me by not actually addressing it, but actually it took away from me the chance to make the most of those last weeks, have conversations I would have wanted to have, etc.
Even if he doesn’t want to deal with it (us alcoholics often want to keep our heads in the sand when we’re still in active addiction, which he will be at this point, even if he’s been forced to stop drinking), I would talk to your dd about what might happen in an age appropriate way.
Do you listen to podcasts? There is a really emotional podcast done as part of One for the Road, which is a sobriety podcast, with someone who lost her former partner to alcoholism. It may be a tough listen, but I found it really moving and I learned a lot from it about what it’s like to support someone at that stage.