I would tell her "you are more than welcome to stay here but in doing so please know I will NOT leave and you will be respectful of my boundaries while here"
Like no OM here, no calling/texting OM in front of me.
Me: 35 husband:39 Sons 16 and 11 from my first marriage Twins 5 (boy/girl) Daughter 3 Affair bomb 2/27/14 He moved in with ow 3/13/14 OW kicked him out 6/15/14 4/2016 he seeks help for sexual addiction