Originally Posted by Derbylicious
There's always the option of talking to your friend and letting her know that you would like to know from her if she is interested in one of your partners before approaching them. If you have expectations of someone it's best to let them know what those expectations are. If you do tell her and she does it again then you have cause to be upset about it.
I agree with this. You're not going to know what she was expecting or wanting unless you talk to her. You're also not going to get any change in her behavior unless you express your need for a change.