Legal Question in Real Estate Law in California

Not unless there is a local rent control ordinance on the subject, and if there was such a case, I'd fight it if I were you.

No. You would have to comply with state law regarding unlawful detainers, and any local rent control ordinances, however, if there are any.

No. The most a disability or similar hardship might get the tenant is relief from forfeiture, i.e., she might have a right to reinstate herself by paying up before eviction even if your notice to pay rent or quit declared that the lease will be forfeited if she fails to pay. However, you can proceed with the eviction process normallyas long as no pay-up occurs.

No. Serve your proper notices and follow up with unlawful detainer filing if not paid.