Were you in the U.S. at that time, as a permanent resident? If so, you qualify, and you can just file for a US passport.
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.
I concur with my colleague, if you were a permanent resident and in United States at the time your mother became a United States citizen you should be able file for citizenship based on your mother's naturalization
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