McGuinness also won its 11th straight team championship.
"Her competitiveness sets her apart. She’s just so intense when she’s out there and doesn’t want to lose,” said teammate Mia Lancaster.
Ritchie was tested in the championship match by Tulsa Bishop Kelley’s Andrea Lewis, even trailing 4-1 in the first set, but bounced back to win the championship in straight sets.
Ritchie doesn’t lose against her high school competition, and losses at the national level aren’t that common as well.
Ranked in the top 35 nationally for her age group, Ritchie has already committed to Oklahoma. She will join teammate Katelyn Connelly and former teammate Peta Maree Lancaster as part of the Sooners squad.