I'm Lucy, and I'd be happy to answer your questions today. I'm sorry to hear about your situation.
First, and most importantly, you absolutely CANNOT change the locks or put her out. She is legally considered your tenant and you are legally considered her tenant. If you change the locks to force her out, she can sue you for a penalty of $100 for every day she's locked out, plus a court order granting her access back to the property, plus her attorney's fees. Cal. Civ. Code, Section 789.3. That leaves you in a MUCH worse position than you're in now. The fact that you sublet without your landlord's permission unfortunately doesn't change your legal obligation to your tenant. She could sue you if you get evicted and put her out without a proper notice.
I'm not sure if that's a typo above, but a 30 day notice served on October 17 would be valid December 1, not November 1. That's what's required for a regular, no-fault eviction notice. If she's doing drugs in the apartment or bringing johns into the apartment, then you could give her a 3 day notice to vacate. It's a violation of the lease to use the premises for an unlawful purpose.
Your management company should give you a 3 day notice to vacate in order to avoid eviction. If she's not out, the they can go to court and file a Complaint. It can take time to get a court date, so it's theoretically possible that she'd be gone before it gets to that point (and you can stall by asking for discovery, if you have to). Because your subtenant has a right to remain on the premises through December 1, if you get evicted before she leaves, she could sue you for damages. A three day notice can avoid that, if she leaves. Or you could consider trying to work out a deal where she agrees to leave and not sue and you agree to pay her some amount of money you think is fair (in order to get to stay in your apartment). That's a decision you can make after you see if the landlord files for eviction - if she's out before the court date, you'll win the case.
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