Final answer:
An accurate answer requires additional context about the literary source in question, such as the book or story title and the author's name.
Step-by-step explanation:
The question "What is Stina's backup girl's name?" seems to refer to a character within a literary context, book, or possibly a story studied in English class. However, without specific information about the text or story in question, it is not possible to provide an accurate answer.
To properly assist you, more context or details about the source material, such as the title of the book or the author's name, would be necessary. If you can provide this additional information, it would be very helpful in pinpointing Stina's backup girl's name.