I agree she needs to go. I just don't think getting the police involved and serving her an eviction notice with 3 days, or 2 weeks,, to get out is the way to do it. It should be a conversation along the lines of "W, I understand you feel you should be able to have anyone you wish in your own home. I agree and that is why I think it is time you find your own home and you need to do so in the next 60 days" etc..
^^^^ SP, I think LTH hit it nicely here. IMO, getting your W evicted is extreme, moving her belongings etc. You can stand by your boundary without evicting your W. You had a good plan of finding out your rights in your property--did you follow through? I do think you have grounds removing OM off your property--well not you but law enforcement if it comes to that. I sense your anger and I understand, so avoid face to face with OM probably not a good idea.
Good luck
Newman
me40; W43 M18; T~20 D18; S13 & S3 bomb 5/9/11 EA busted 4/30/12; 9/4/12; 4/29/13; 6/10/13 same OM
Separated 4/1/14
"Even a flicker of light will shine through darkness-12/25/2012"....better days ahead.