Chiney Ogwumike scored 21 points and grabbed 11 rebounds as No. 1 Stanford beat Gonzaga 69-41 on Sunday.
"We're young," Graves said. "We're not where they are right now."
The Zags are coming off three straight trips to the round of 16. But they shot just 25 percent in losing, a statistic that Stanford coach Tara VanDerveer noticed.
"They didn't shoot as well as some other Gonzaga teams have," she said.
Taylor Greenfield scored a career-high 18 points, hitting six 3-pointers, to help the Cardinal (8-0) beat Gonzaga.
"It really shows what kind of team we are," Greenfield said. "When someone is hot we find them. They want you to shoot until the streak ends."
Greenfield made 6-of-8 from 3 point range as Stanford shot 49 percent from the floor to overwhelm Gonzaga early.
But the Cardinal appreciated the sold-out crowd of 6,000.
"Gonzaga is really a fun place to play," Greenfield said.
Taelor Karr and Haiden Palmer led cold-shooting Gonzaga (6-2) with 10 points each.
"Defensively we did some good things," Graves said. "But you can't expect to shoot 25 percent and beat anybody, let alone one of the best teams in the country."
Stanford held Gonzaga to 1-of-14 shooting in the opening seven minutes, and Greenfield made three 3-pointers, as the Cardinal built a 17-5 lead.
Palmer scored a pair of baskets for Gonzaga to cut Stanford's lead to 25-9.
Stanford's shooting cooled off and a basket by Karr cut the Cardinal advantage to 14. Ogwumike scored and Tinkle hit a 3-pointer to lift Stanford of a 32-16 halftime lead.
Gonzaga shot just 17.9 percent (7-of-39) in the first half, and did not attempt a free throw.
The teams traded baskets through the first 10 minutes of the second half, and Stanford gradually extended its lead. Greenfield's sixth 3-pointer gave the Cardinal a 52-28 lead with 10 minutes left in the game. Gonzaga did not threaten after that.
The game featured a matchup of sisters Joslyn Tinkle, a senior at Stanford, and Elle Tinkle, a freshman at Gonzaga. Their father is Montana head coach Wayne Tinkle, who wore a shirt with "Gonzford" written on the front.
"It's a special feeling for them to watch their daughters out there and at this level," Joslyn said. "It was extremely fun."
Joslyn Tinkle had 16 points and eight rebounds. Elle finished with two points and 3 rebounds.
Stanford is coming off an 87-38 win at UC Davis in which they held the Aggies to 18 percent shooting. Stanford improved to 5-0 against Gonzaga.
Stanford's last loss was in the semifinals of the NCAA tournament national semifinals to Baylor.
Gonzaga's only other loss this season was to No. 7 Louisville. This is the second time they have played the No. 1 team in the nation, losing at Tennessee in 2007.