After everything is over and done with, right before you leave, tell her you're sorry that she was hurt enough to make up lies to this effect. Do this profusely, if you can stand it. Make her feel like shit. And if that don't work, tell her it wasn't a gay man, it was her bff, her sister, or her brother. Or her brother
and sister.
I feel for ya, Chris. I probably wouldn't bring it up. I'd just look at her, smile, and chuckle. Out loud.