How much zinc in supplement daily. Ok?

I consulted child specialist for my daughter of 10 years of age. I visited for some vitamins supplements. Actually she looked some weak. Two months ago the doctor prescribed her R.B Tone kids 5ml once and V & M syrup 5ml twice for 3 months. But since few days she was having pain sometimes in the knees. I consulted orthopaedic and everything is normal. So, I thought to give her calcium supplement. But her already two vitamins were going on. So, I decided to ask the same Pediatrics. He then discontinued R B Tone and suggested v&m syrup 5ml and Calcimax D 5ml both twice for one month. But my question is that bot syrup contains zinc 2mg. So, at each time she is taking 4mg zinc. It is ok ? Her age is 10 years, weight 35 kgs and ht 4'7". Please suggest is it ok ?