The proper dose is more like 2.25 mL (a little less than 1/2 teaspoon) every 8 hours. Be sure to call your doctor and tell him or her about the mistake - also your pharmacist who should have caught this huge error.
If she were my daughter, I would hold the antibiotic since she's already had her day's dosage plus some. I would give whatever you normally give her for fever (Tylenol, Motrin) and watch her. If the fever doesn't come down and stay at a reasonable level (101º) then you need to get the doctor on the phone. The poor little dear is going to be cranky because she doesn't feel good.
The dose of amoxicillin is 20 mg/kg/day in divided doses (usually 3 doses, but some doctors use 2). Your daughter weighs 35.3 lbs which is 16.01 kg
16.01 kg x 20 mg/kg = 320.2 mg per day dose to be given.
The medication contains 250 mg/5mL and you want to give 320.2 mg.
If there are 250 mg in 5 mL, then there would be 50 mg in 1 mL. You need 320.2 mg divided by 50 mg/mL = 6.4 mL to be given per DAY, but you want to divide this in 2 doses of 3.2 mL each( or 3 doses of 2.13 mL each)
Just as an aside, 14 mL of 250 mg/5 mL would be a dose of 700 mg.
The high level dosage for children with serious infections is 45 mg/kg/day X 16.01 kg = 720.45 mg/day divided by 50 mg/mL = 14.41 mL per DAY in divided doses. Thus what your doctor told you in the office would be right. You would give 7 mL every 12 hours.