Apraxia

My daughter was physically abused on her head at 9 months of age. She is now 2 1/2 years old and has had MRIs, CT scans and x-rays over the last couple years. No physical damage was noted on any of these tests. However, she has had speech problems and has been in therapy for over a year now. Her expressive language is very slow and she is very behind. All the red flags are pointing to Apraxia.

Her older brother also had speech problems, but they were different and were due to a PDD diagnosis. Because no temporary/permanent damage was ever noted on her brain, can apraxia still be caused by just the physical head trauma alone without any noted damage to her brain?