If he shook her violently enuff, it would certainly damage her brain & could certainly put her in a coma. This happens with "shaken baby syndrome," or "abusive head trauma" unfortunately all too often.
"Abusive head trauma/inflicted traumatic brain injury also called shaken baby/shaken impact syndrome (or SBS) is a form of inflicted head trauma. Abusive head trauma (AHT) can be caused by direct blows to the head, dropping or throwing a child, or shaking a child. Head trauma is the leading cause of death in child abuse cases in the United States..."
http://kidshealth.org/parent/medical/brain/shaken.html
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"Symptoms of shaken baby syndrome include extreme irritability, lethargy, poor feeding, breathing problems, convulsions, vomiting, and pale or bluish skin. Shaken baby injuries usually occur in children younger than 2 years old, but may be seen in children up to the age of 5..."
http://www.ninds.nih.gov/disorders/shakenbaby/shakenbaby.htm
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my bold
When did he shake her the 1st time, and how many times thereafter? We will never know, but I'm sure many of us have an educated (by now) guess. It doesn't take a hammer. Grrrrr.