Oberholtzer earned second team All-State as a junior before garnering first team accolades as a senior as a team captain. She was also named a scholar athlete in her final season. As a sophomore, Oberholtzer ranked second on her high school team in scoring. In club soccer, she was a team captain for the Massachusetts Maple League Aztecs, as well as a member of the U17 Olympic Development Program (ODP) select team member. A three-year varsity letter-winner in track & field, Oberholtzer also placed sixth in the state championships with a time of 5:24 in the mile run. She was also a letter-winner in girls' basketball.