I have to 100% agree with @Nathan Gesner on this one. Being an investor, self managing my own portfolio PLUS 30 years in law enforcement as a police/fire/911 dispatcher - this nothing more than family drama.
As mentioned above, she is also half owner, and has the same rights to the property as you do. Would you really ask for her permission if you wanted to go there? The ONE exception to this would be if there is a court order, such as an Order of Protection issued by a Judge and the property was listed as a "protected address" then she would be prevented, by court order to be there, however that is highly unlikely for a rental property. Also, your estranged wife did not legally "trespass" as she is co-owner, and even without giving notice it's not a criminal offense for her to be there.
I get it, have been divorced (more then once) myself plus decades of call like this on ABC (you pick subject) and it all boils down to the same thing. Absolutely no offense mean @Robert Vanecek just let it go my friend. Its difficult to keep emotions out of it but you will be much better off in the end if you do/can.
Mark