There are some good lessons here.
Are five shots enough? Yes, unless they aren't, as in this case.
Do head shots always produce incapacitation or death? Definitely not. Most of the head isn't CNS and the face is part of the head.
Neck shots are often as good as head shots, meaning they don't always result in incapacitation either.
Even when that many shots hit that region, if they don't hit vital cardio or CNS structures, the bad guy can sometimes still function.
Slater is expected to live. Heck, he was in good enough shape to cry and plead for his life and then get up and go drive away. Granted, he eventually crashed...
She did well, but I am still puzzled as to how she missed vital CNS structures that many times while hitting the general area.