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Alyssa is upset with her sister. Assuming that this will be make even more obvious by context, I think the text is fine as it is. You could make the sentence perfectly clear, but keep in mind tha...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/46593 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Alyssa is upset with her sister. Assuming that this will be make even more obvious by context, I think the text is fine as it is. You could make the sentence perfectly clear, but keep in mind that this isn't tech writing. The protagonist is angry here, and probably not thinking logically. Trying to achieve perfect clarify would probably take the soul of the writing away.