I think the foundation of practice for a H is learning to improve connection and learning to be more considerate. With that in mind, you let your W have time with her friend, even though it disrupts your plans, and you don't approve of her friend.
If you make a fuss about it, you're going to be viewed as controlling and selfish. You don't want to spend time with your XW anyway, if she would rather be elsewhere.
You're going to need to work on working with your situation as it is, versus trying to control your W to fit your expectations.
CL
CL 53 W 54 M 20 yrs. 03'-09' Separation + Old Patterns + GAL 10-14' Piecing
"The Master allows things to happen. She shapes events as they come."