Conversation so far:
What was the first publication date?
The fictional Kitty Pryde first appeared in Uncanny X-Men #129 (January 1980).
How long was the publication?
CANNOTANSWER.
Who introduced the character Kitty Pryde?
Uncanny X-Men artist John Byrne named Kitty Pryde after a classmate he met in art school, Alberta College of Art and Design in Calgary in 1973.
What is the story behind the name Kitty Pryde?
He had told Pryde he liked her name and asked for permission to use it, promising to name his first original comics character after her.
Where did the Kitty part come from?
Claremont said several elements of the character's personality were derived from those of X-Men editor Louise Simonson's daughter, Julie.
What were Kitty's powers going to be?
Claremont and Byrne made the new character a full-fledged X-Man in issue #139, where she was codenamed "Sprite".
How was Kitty accepted into the Xmen issues by readers?
Shadowcat's popularity had a profound effect on the real-life Kitty Pryde: the latter became so overwhelmed by attention from Shadowcat fans, she abbreviated her name to K.D.
Pryde.
How long did Kitty last in the Xmen series?
CANNOTANSWER.
What else was interesting about this characters history?
She remained a part of the X-Men books until 2008 when she left again for roughly 2 years.

Question: Why did she leave for 2 years?
Self-contained rewrite: Why did Kitty Pryde leave for 2 years?