Legal Question in Workers Comp in California

That is a very long and somewhat confusing single sentence question. If I understand you correctly, she had an injury at her prior place of employment and is still being treated for that, but also alleges that at your job she aggravated the injury. The change in employment does not relieve the former employer from his obligation to provide medical treatment and WC benefits for the original injury, but the second employer is responsible for any treatment or benefits resulting from an increase in the injury. The treating physician has to be asked if he/she can determine what part of the treatment is for which injury. That the employee was fired is irrelevant as to whether they suffered an on the job injury.