If she's enthused about the live pup, the next time use one as an appetizer, & have a f/t rat of a more appropriate size thawed & ready to offer the moment she
finishes the pup. Snakes are all pumped up at that point & may not think twice, just eat the 2nd item. If not, you can also try "chaining" one after the other, but
you have to be slow & sneaky so a nervous snake doesn't drop the 2nd rodent. I'd never feed live rats (with eyes open, & especially adults).That's just
asking for injuries. Fresh killed might work also, you just need to use tongs to move it a little & NOT towards the snake...you want to snake to feel like it's giving
chase or ambushing clueless prey.