Legal Question in Landlord & Tenant Law in California

Of course she can have it towed. If she is the one who is entitled to possession of the premises, she has the right to remove vehicles that are on the premises. Whether the tow was legal is another issue. In most cases, to tow a vehicle certain steps need to be followed. You have not posted enough information to know whether she was entitled to tow it or whether the tow was done properly.