It depends on when they get them. My daughter got hers at a year, and she just lost her first tooth at 5.5. So if yours had hers at prior to a year, she should lose them earlier. It's totally relative to when those baby teeth first popped up, when they pop out. That's why babies who get teeth later in the first place, are said to have their teeth longer in life.
This is from an article I read. But I think your girl is right on track. I work with exactly this age group, and 5-6 is the age when they start coming out. As early as five isn't abnormal.
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