What does your contract say? If you are asking us here, then your agent isn't available? Someone familiar with your contract needs to advise you. There is a solution, perhaps it is already covered, if not, then you will need to renegotiate and determine if the house is worth it if you face the possibility of having to evict the tenant after it closes. Contact the broker where the agents works, they are actually the "boss" of your agent. Most all brokers will gladly help you, if the relationship with your agent is less than wonderful. You will have to do that at some point anyway if there is a problem It is common for someone to stay there until the last minute, there may not be a problem.
With all respect to the agent from Florida, CA is different, we don't use attorneys unless there is a potential of litigation and that is usually after escrow closes. There is no "closing table" here. Escrow handles all the flows of funds and paperwork as it arrives and transfers money and paperwork to the parties. I'm assuming you aren't licensed in CA or you would know that. I'm trying to say that nicely, It is totally different in California. Realtors do what your attornies do apparently. The parties never meet physically together here except by chance. Everything transferred in bits and pieces throughout escrow. Please no comments on how odd that is, it works for us.