Never feed jumbo mice to corn snakes...jumbo mice are older breeders & they're very fatty!
I typically feed adult corn snakes (of normal weight) every 2 weeks, & at the most (in warmer months of summer) every 10 days.
Your snake is used to eating so often that she's going to be mighty unhappy eating every 3 weeks, and her metabolism might be better off if you fed her a
SMALL adult mouse every 2 weeks...I think that's what I'd do. Snakes are notoriously hard to put on diets & if they're anything like people (?), going so long
without food might trigger them to metabolize slower (conserving energy) to preclude starvation, making the "diet" backfire.
Branches are a good idea...And that's AWESOME that your BP is 29 years old!
I kept & worked with rattlesnakes for many years (though no longer) so I'd love to hear about your Northern Pacific sometime...I lived many years in So. Calif.![]()