Hello ,your baby is 6 months old so at this time she can sit with support and when it comes to walking might be she is not able to do it.
If she has pain/sway in left leg while standing straight then u can consult pediatric / orthopadic doctor as well as it might be due to
vitamin d deficiency so please continue vit- d drops 0.5 ml once a day for upto 1 year .
Health Tips
vit - d levels
vitamin - d drops 0.5 ml once a day with milk