Honey, I'm so sorry.
I've heard varied reports about this treatment. We've had patients who have had a complete recovery after having it, some who bought some valuable time by having it done, and then some who's disease was so aggressive that pallative care was the only option.
Unfortunately as Daiwa said, the younger the person the more aggressive the disease tends to be. And, if it's already metastasized from it's original location.....well, then the odds for a complete recovery are against her. I'm sorry, chickie. I wish that I could tell you it's nothing to worry about and that she'll be fine, but I can't. I don't want to be a voice of doom either because there's always a chance for recovery, but she's got a heck of a hill to climb to get there - and you already know that so I won't dwell on it.
Just because a hospital discharges her, doesn't mean she's well enough to travel. I would strongly suggest that she take you up on your offer and stay with you at least the first night after the procedure. That way if she has any adverse reactions that require medical treatment or intervention she'll be close to a phone and help.
If there's anything I can do, please let me know. I'm always here for you.