Lots of people will say it is too young to put her on cows milk, however, my first son was on 4 solid meals per day, and draining me at every feed, and still wanted more. I tried to supplement him with formula, but he hated every one. I tried 5 different ones, then out of sheer desperation, gave him diluted cows milk. He loved it. He was 7 1/2 months old. I also put my daughter on diluted cows milk at 7 months and she loved it, and my baby boy loves it now. He is 10 1/2 months, and has been on diluted cows milk since 9 months. I was also giving them all pentavite vitamins (from the chemist), as cows milk doesn't contain the vitamins breast or formula does.
A friend of mine put her daughter on cows milk at 6 months, but didn't dilute it and she got the runs, so if you choose to use it, make sure it is diluted 50% milk, to 50% boiled water until at least 12 months of age. My friends daughter was fine after her mum started to dilute her milk and is now 17 months old with no problems.
Some people will say that giving cows milk will give your child allergies, but my kids are now almost 11yo and 8 yo and neither of them have any health problems caused from having cows milk. Hope this helps you.
Mother of 3, Qld