J.M.
Just a question. Are there only certain schools in the DM district that offer full-day? For WDM, there was only one school this that didn't do full-day, and by 2008 the district says they will be. I know in WDM as of april I can sign my son up early (1 year in advance) to ensure his enrollment.
i would call the DM school you are interested in and talk to them about your concerns. Most schools are going to be converting to full-day. Ask them what your options are going both ways. And if they say she'll have to be 1/2 day, ask them who specifically will be responsible for her then since you are working. I have heard from teachers that DM schools are not having such a problem w/overflow that the "Burbs" are having, and they get a lot of calls about that and they really haven't reached a point that someone's not going to get in.