Wife just died what do i do with our daughter?

she's 3 and i have already mentioned that i don't want anything to do with her, but shes asking questions. i have continually told her that mommy died because of all the drugs she was taking but she isn't understanding that./ i have told her hat mommy isn't com,ing back and we won't see her ever again, not even in heaven since i don't believe in god. she still looks at me blankly. she also seems upset that i never respond when she says :"i love you' i just walk away and ignore her. what should i do?