Yes, this was an appropriate strategy for her speech as this is a concluding strategy known as a reference to the introduction.
A reference to the introduction is an appropriate speech strategy in which a writer makes an important and engaging point in the introduction. He then concludes his speech by providing more details or a conclusion about that point in the introduction so that the listeners are more engaged in the conclusion too.
In the case above, Kristen first mentions her friend who suffered from anorexia in the introduction. Sharing this information helps her to better connect with her audience. She then uses the same point to conclude as a reference to the introduction because the audience will be more satisfied.
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