But her mother noted that Reagan "is only a seventh-grader, so she hopes she will be back" for the national spelling bee next year.
He takes home $40,000 and a trophy from Scripps Bee, which is sponsored by the EW Scripps media group, in addition to a $2,500 cash prize from Merriam-Webster, the dictionary publisher.
She successfully spelled "arbitration" on Wednesday.
The two remaining Californian contestants - Paul Hamrick of Monterey and Aisha Randhawa of Corona - were knocked out two rounds later. The hundreds of precocious spellers, ranging in age from 8 to 15, stepped out from all 50 states. She lost the competition by misspelling the word bewusstseinslage, which is a state of consciousness or a feeling devoid of sensory components.
Preliminaries for the Scripps National Spelling Bee, which took place May 29-30, consisted of a written test and two rounds of onstage oral spelling.
Karthik Nemmani, an American of Indian origin has won the 91st Scripps National Spelling Bee competition.
Karthik Nemmani poses with the championship trophy and E.W. Scripps Company CEO Adam Symson.
Third place contestant, Abhijay Kodali, is also from Texas. Individuals who don't have access to a television but do have a cable subscription can stream the contest through ESPN's website.
RSVBee created the record-breaking pool of competitors, which prompted the Bee to add an extra day of on-stage spelling to the tournament.
Karthik's cousin, Sri Nemmali, also competed in this year's bee and marveled at Karthik's discipline and study habits. But then the three-time Missoula County spelling bee champion will once again hit the books.
He said there were eight or nine words during the prime-time finals he didn't know - a rare admission for a national champion.
The nationals in Oxon Hill, Md., began earlier this week with 516 spellers - an all-time high in the 93-year history of the event - and Thursday's finals started with 41.
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