You can't. Then, you'll want to say something to impact her decisions. Don't even try....
And if SHE brings it up to ME, which she is almost certain to do since my "I guess" seemed kind of equivocal? How should I handle that? "Hope you have a good time." (?)
H53/W51, R-ing 4/'18
"Do not arouse or awaken love until it so desires"-Sg.of Sg 2:7
"So oftentimes it happens,that we live our lives in chains, & we never even know we have the key"-Eagles III 1:3