LOS ANGELES -- Vanessa Bryant expressed grief and anger in an Instagram post Monday as she copes with the deaths of her husband, Kobe Bryant, their 13-year-old daughter, Gianna, and seven other people in a helicopter crash last month.

"My brain refuses to accept that both Kobe and Gigi are gone," she wrote. "It's like I'm trying to process Kobe being gone but my body refuses to accept my Gigi will never come back to me. It feels wrong. Why should I be able to wake up another day when my baby girl isn't being able to have that opportunity?! I'm so mad. She had so much life to live."

Bryant said she realizes she has to remain strong for her three surviving daughters, Natalia, Bianka and Capri.

"I know what I'm feeling is normal. It's part of the grieving process. I just wanted to share in case there's anyone out there that's experienced a loss like this," Bryant wrote. "God I wish they were here and this nightmare would be over. Praying for all of the victims of this horrible tragedy. Please continue to pray for all."

The social media post included a video feature from Slam Magazine about Kobe coaching Gianna's basketball team. Kobe Bryant was killed when the helicopter carrying him, his daughter and seven others crashed into a mountainside in Calabasas, California, while flying to a girls' basketball tournament at his Mamba Sports Academy on Jan. 26.

A public memorial for Orange Coast College baseball coach John Altobelli, his wife, Keri, and their daughter Alyssa was held Monday. Also killed in the crash were pilot Ara Zobayan, Christina Mauser, Sarah Chester and her daughter, Payton Chester.

Vanessa Bryant announced last week that a "celebration of life" memorial will be held Feb. 24 at Staples Center to honor her husband and Gianna.