I'm a mother of 2 special needs children. My 4 year old started the bad behavior of hitting her older sister 15 years old & well everyone except me. I'm the tough parent & I turn tv off~send her to room or scare her with hitting her with the slipper it's a Dominican/Spanish thing I guess. She gives no issues in school. I would send your baby girl to her bed no tv or time out. Kids needs to know parents are the boss we are in control. You vent away. We are here you make you feel better. Keep your pretty head up & don't let your baby girl get the best of you.