Answer:
The incorrect pronoun shift in this sentence is the shift from "her" to "their."
"The captain" is a singular noun, so the pronoun "her" is used correctly to refer to the captain. However, "teammates" is a plural noun, so the pronoun "their" should be changed to "her" to maintain subject-verb agreement and consistency with the subject.
A corrected sentence could be: "The captain, along with her teammates, believes that her new coach will help the team win."
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