Cannabis related cases dropped precipitously during her time as DA but mainly because she forced the racial disparities in the prosecutory policy to be eliminated. To expect her to have been in the court room for minor offenses as DA or to give everyone a pass when they were breaking the law would have been a breach of her fiduciary responsibility to her client, which was the state. That would be enough to lose one's job as DA.
As a lawmaker, it is now her duty to change the law whereas before, it was her duty to enforce it, beholden to the governor of California. As a lawmaker, she introduced a bill to deschedule marijuana and expunge convictions at the federal level. It is something that you should consider supporting. I'm trying to be polite but to hate the one person up there who is actually doing the most for cannabis legalization because you feel that she was on a crusade against us, well it doesn't win points for intelligence.
She was the DA. She did her job and she actually had an effect contrary to what you seem to be claiming. Gabbard was citing one of the most biased right-wing sources that doesn't pass fact check.