Orthopaedic Surgeon
Knock knees in a 9 year old is not necessarily abnormal. In the first year of life infants are usually 'bow legged', with varus alignment of their lower limbs. This corrects to neutral by around age 2, and then from the age of 3 it's normal to be 'knock kneed' ie valgus alignment. The valgus alignment is maximal around age 3-4 before lessening to ~6 degrees of physiological valgus during childhood.
The short answer to your question is that a chiropractor can't do anything to change lower limb alignment. If your daughter is extremely knock kneed and you're concerned about her overall alignment and walking, then you should get your GP to refer you to a paediatric orthopaedic surgeon who can assess for any torsional/rotational lower limb deformities and provide appropriate advice.
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