Get a copy of the policy. Cars are NOT normally covered. I do not know if the engine being out makes it a trailer, which would typically be covered.
What neighborhood is your mom's house in? Much of Santa Rosa is not in imminent danger.
I would suspect not, but this is not an informed statement. You should call your mom's agent.
You can call George Peterson Insurance, they said on KSRO today that they will answer questions even for people who are not their customers.