So glad you found Xena!!
How terribly frightening that must have been. I'm sure you were greatly relieved to have her back safe and sound inside again.
I think that is the worse living nightmare a cat owner can experience...just not knowing where they are or what happened to them.
Years ago my first Siamese cat, Ping, use to try escaping -all- the time. We let him go outside, but only on a leash then and had been doing it with him since a tiny kitten. He loved being outside so much that at every opportunity the door was opened he'd make a dash for freedom.
Once outside we would spend so much time chasing him and hunting him down to bring back in. Then one day, at age 15, he did it again...I was just so tired of this game with him that I made the -bad- mistake of saying "Oh, what the heck, he's old and won't go far"...later we couldn't find him.
The next day, very early, before we could recontinue our hunt for him, the phone rang. It was from a person who found his body in the road...I had had a collar with a name tag on it.
Hard lesson

....learned.