There seems to be something that is making her feel uncomfortable. Please consider all possibilities and investigate to find out the exact cause. A child crying without overt provocation could be due to: 1). Physical causes eg., (a). Uncomfortable temperature such as a cold Air conditioner, (b). Lack of fresh air, (c). Mosquito or other insect bites, (d). Chemical mosquito repellents causing irritation to her upper respiratory tract, (e). Uncomfortable ill fitting synthetic clothes, (f). Hunger for food etc., 2. Psychological causes eg., (i). Feeling insecure because of your absence from home during work hours (ii). Abuse of the child by caretakers. This could be again physical, emotional or even sexual (iii). Craving for bonding with a mother who is unavailable during daytime and asleep during the night. 3). Medical causes eg., a health issue which could be as simple as a urinary tract infection or indigestion of food. My thinking favors more of the insecurity angle. Your child might be craving for your love. You may need to be demonstrative with your love for her such as by embracing her genuinely for longer than the usual hug, touching, patting gently and caressing while putting her to sleep, singing a lullaby, reassuring her, sharing your daytime silly stories, playing games together etc.,

Hi.. It seems u r nearing ur wits end.... Pls seek professional help.....a good paediatrician....if that doesn't help a child psychologist or psychiatrist... This is a common situation n with proper guidance am sure u will be able to get over it. Hope this helps. Rgds