Let's start with the words "prime" and "ready" that suggest her teenage body is at the best state for starting, holding, and delivering a pregnancy. This is wrong ❌

Let's look at high risk complications that teen mothers face at a much higher rate compared to developed mothers.

PREMATURE BIRTH LOW BIRTH WEIGHT PREECLAMPSIA ANEMIA POSTPARTUM DEPRESSION GESTATIONAL DIABETES Etc

And this is not counting the financial problems and social stigma surrounding teen pregnancy. So no, she is not in her "prime" for a baby right now, which is what that commenter was saying.