Pat,
Could it be parts of the dream are addressing similar emotions that were a part of the relationship between mother and child? You state although you loved your mother she did not affectionate or verbal about her love. Could the recent broken relationship with your oldest daughter some how play into that pattern? In my interpretation I mentioned the possibility of a complex. Look at the two relationships and see if there are related aspects. There may be unconscious forces {being underwater} that are in play and you have yet to work them them.

Jerry