She needs to grand admin access to someone else who has their own personal Facebook page. If she does this before she leaves, you can test it to be sure that all access is transferred, and it would be a good idea to change the credit card information as well.
It's not difficult to download the historic stats from the Ads manager, so you can also have access to that information to distribute among others.
Hope this helps!
All the best,
Tricia Maddrey Baker
Social Media and Communications Manager
AAMDSIF (800) 747-2820 Extension 133