Assuming your daughter wants to see her mom ... and mom has a significant proven track record of sobriety (I like the person who suggested six weeks of proven sobriety, etc. etc.) ... I'd suggest something super, super, super small. Lunch, for an hour or so, at the mall. You drive there and home; and just go shopping for that time while they have lunch together.
I wouldn't even spend any money or think think about any legal changes until much further along and, perhaps, many, many, many successful lunches - and some significant counseling. If mom wants something else much faster ... well, then let her do all the work to make it happen. You do not have to do anything.