"Sydney is one of the premier shooters in the state of Indiana," Homestead coach Rod Parker said in a release. "Sydney will be a great asset to the Butler program."
Buck has drilled 119 three-point shots for the Spartans, as well as connected on 90 percent of her free throws.
During the summer, she competes for the Spiece Gym Rat FW 2014 squad.
"Sydney will fit very well into the Butler system," Spiece coach Gil Farley said. "Her shooting ability and high basketball IQ should make an impact for Coach (Beth) Couture and the Bulldogs.
Buck selected the Bulldogs over Southern Illinois, IUPUI, Ball State, and Wright State.
"Butler seems to be the perfect fit athletically and academically for Sydney's collegiate career," Farley said.