The normal age for the first tooth to erupt is 6 months. That doesn't mean you need to worry about your daughter —the average age given is simply an estimate. Some children get their teeth early, some later. Your daughter is on the later side, but I would have a dentist exam her just to be sure everything's okay.
Our parenting advice is given as suggestions only. We recommend you also consult your healthcare provider, and urge you to contact them immediately if your question is urgent or about a medical condition.