The sophomore scored one goal and set up another in a 2-0 win at No. 2 Stanford on Friday night and scored both goals two days later in another 2-0 victory at California on Sunday.
Cheney has scored 16 goals and six assists in 14 games for the Bruins, who have not lost since falling to Texas, 2-1, in their season opener.
She silenced a capacity crowd at Stanford's Laird Q. Cagan Stadium when she converted on a penalty kick in the 37th minute after being taken down in the box. She then fed junior Christina DiMartino for the insurance goal with 15 minutes remaining in the game.
The Bruins have yet to give up a goal in four Pac-10 games. They got a big weekend from Valerie Henderson in goal and welcomed back Erin Hardy, a third-year starter on the backline, from a knee injury suffered earlier in the season.