In the consolation bracket, De Leon edged UC Santa Barbara's Stephanie Yamada, 6-3, 6-4 in the quarterfinal, but fell to the tournament's third-seeded player, Northwestern's Erin Larner, 6-4, 6-0 in the semifinal.
The Titans return to action on Friday at the CSUN Matador Invitational.
Singles Consolation Quarterfinal
Camille De Leon (CSF) def. Stephanie Yamada (UCSB), 6-3; 6-4
Singles Consolation Semifinal
(3) No. 61 Erin Larner (Northwestern) def. Camille De Leon (CSF), 6-4; 6-0