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Those are great results. Amenorrhea (absence of periods) is defined as not having had a period by age 16. Since your daughter is only 13 and all her hormones are perfect, she is likely just going to start a little later than some other girls. That is nothing to be concerned about at all. Some young women do not menstruate for the first time until they are 14 or 15 years old. Her pediatrician has likely already noted her Turner stage. You can check out Turner stages here: http://www.fpnotebook.com/endo/exam/fmltnrstg.htm
If everything else is fine, she is probably just going to be one of those who menstruates late rather than early.
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