How do I stop my neighbor's visitor from blocking me and my tenants' garage everyday?

I own three garages attached to my house. I rent two out. A crazy woman who visits the apartment building next door has been illegally parking and blocking all three of us nearly every day. We have a clear curb cut, yellow line, and signs. I've talked to her but was met with screaming and hostility. I've called 311 on her but she leaves when she sees the police (which doesn't come until hours anyway). She thinks because I have her number that I can call her to ask her to move (off MY property) and that gives her permission to park there. My tenants are pushing me to find a solution. I am in the process of installing security cameras and we are opened to ANY legal way to fight back.