trying to keep a whole closet grow form your mom will be hard and you going to need lots of material to have a really good grow, i advise you to consider a cabinet grow in your closet. trying to keep a closet light and air proof as needed will be hard and you still need to vent the heat and during flowering you still have smell. give us more info on teh size of you closet kind of door and your plans so far etc. then well be able to help you out more.