Galdiano earned Rolex Junior All-America honors for the third consecutive year and was named to the First Team for the first time. The Punahou School senior did not finish outside the top 15 in her six AJGA events in 2015 including a third-place finish at the Rolex Girls Junior Championship in June. Galdiano competed for the victorious United States Team at the PING Junior Solheim Cup and qualified for the U.S. Women’s Open. The UCLA verbal commit is currently No. 7 in the Polo Golf Rankings and won the Canadian Women’s Amateur Championship in July.
| Rank | Event | R1 | R2 | R3 | R4 | Total |
| 2 | 2015 Junior PGA Championship | 70 | 70 | 70 | 72 | 282 |
| T33 | 2015 U.S. Girls' Junior Championship | 71 | 68 | 139 | ||
| T3 | 2015 Yani Tseng Invitational presented by the Swinging Skirts | 71 | 72 | 69 | 212 | |
| T10 | 2015 Rolex Tournament of Champions | 72 | 71 | 70 | 78 | 291 |
| 3 | 2015 Rolex Girls Junior Championship | 68 | 71 | 75 | 72 | 286 |
| T4 | 2015 Thunderbird International Junior | 69 | 73 | 72 | 214 | |
| 9 | 2015 Kathy Whitworth Invitational | 78 | 72 | 150 | ||
| T15 | 2015 ANNIKA Invitational | 72 | 73 | 74 | 219 | |
| 1 | 2014 Joanne Winter Arizona Silver Belle Championship | 66 | 67 | 67 | 200 | |
| T9 | 2014 Polo Golf Junior Classic | 75 | 70 | 145 |