I would start NILIF hardcore, step in and be firm that pushing your female around is not tolerated, and feed seperately so that she can eat in peace.
As for the leash reactivity, it really seems to be a common problem in GSD's. LAT (Leslie McDevitt: Control Unleashed®: Home Page
) and BAT (Official Behavior Adjustment Training (BAT) site: humane help for aggression, frustration, and fear in dogs, horses, and other animals.
) have been extremely helpful for Delgado
Jasmine - Female Miniature Poodle - born Aug 15, 2010
Loker Delgado Von Stalworth - Male GSD - born Jan 26, 2012
Koda & Zazu - 5 year old male cats
Alex - Male Cocker Spaniel (rescue) - RIP Cuddlebug 2007-2010