Paul L. answered 03/07/16
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Hi Lesley,
I have not read the book, but it seems that your thesis statement is appropriate as is. If you want a more direct way to express it, you could go with "Grace Dong-Mei Parker discovers her true identity as she uncovers her Chinese heritage."
If you want to focus more on the journey, you could stay with the same format you have, but edit the wording using a noun instead of a gerund. "Through Grace Dong-Mei Parker’s journey of discovery of her Chinese heritage, she learns her true identity." ("journey of" would be optional) You'll notice that I switched discover and learn because there is no noun form of learn.
I hope that helps.
Paul L.
Lesley D.
02/21/17