Clara enjoyed getting to meet the people in the Doctor's life - past, present, and future. Even if she managed to see the Doctor over the course of his entire existence, she doesn't always remember all of it. Probably best that way considering every version of her died. Jack was fun to hang out with too.

"Shame we can't give them more and be proper Santas to them. Though with the way things are around here, gifts magically appearing might get them into trouble."