Yesterday she told me she went to lunch with the man that helped her on the night she was attacked. (she did tell me this without me asking and I wouldn't have known either way - so she is offering some transparency without asking)
Put your foot down. Tell her where your boundaries are. Tell her it's inappropriate for her to go to lunch with someone of the opposite sex unless you are both going to lunch with him. Period.
And if she doesn't want to respect your boundaries then she should live on her own.
M: 59 W: 53 M: 9 yrs T: 14 yrs No kids together but D30(hers), S27, S24, D21(all 3 mine) W moved out 11/18/2013 D-Day 12/14/2013 W moved back home 12/1/2014