Sorry you are here!
Unfortunately you have no chance of controlling her. None!
No ultimatums, only boundaries.
Check legal circumstances. Not married as I understand?
As mentioned you can probably not just throw her out. The boundary (if you can’t throw her out) would be to either remove yourself (mentally and/or physically) or initiate real separation/divorce.
Don’t tell her parents.

Keep posting. We will help!
Read this:
https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2653323#Post2653323

Last edited by Mumin; 02/04/21 11:13 PM.

Me: 34
Stbxw: 30
D:5 D:3
Mini bd: May/June 2019
Married: Aug 2019
BD: 6th Dec 2019
OM Confirmed: Feb 2020
March 2020: I filed for D
Waiting for D to be finalized and W to move out end of January 2021