"I've got a bunch of miles if you want to use those? I don't know if it's enough to cover round trip but it's definitely enough for one flight?" And she'd be happy to help him see his sister for Christmas. Even if Shara is trying to see him in January.

And maybe she is procrastinating her invitation because she is nervous.

If he could visit his sister she could push this off all over again! Until it's too late! And he breaks up with her for keeping such a secret from him for so long!