Claiming a Capital Loss

My college aged daughter did not receive a W-2 in 2023, but received a 1099-INT, 1099DIV and 1099B. In 2023 she had a Captial Gain/Loss of -$8000. 1) Can I file taxes for her if she didn't receive a W-2? 2) If she doesn't file taxes this year can she still claim the loss in future years?  Thanks for the assistance!