[Sca-librarians] kids movie about being trapped in a library

[Mary]

We've been trying to think of a kids movie from the
70s or 80s about kids who get trapped in a library
overnight. It was perhaps an after school or Saturday
morning special. The main character was a girl. There
are animated parts but most of it was live action.

It's not Pagemaster or Crazy mixed-up files.. or even
The Breakfast Club. 

Can anyone recall of the name of this before my
friends go insane?

Thank you !
Slaine