All sounds good except the chicken broth and the fuzzy.
You need to offer appropriately sized prey. She may not be striking because she doesn't even recognize a fuzzy as prey since they eat bigger than that out of the egg.
And there's no need for chicken broth. Rodents are their natural diet, not chicken. So hiding the scent of rodent with chicken is counter productive.
Lastly, since they're ambush predators it's best to feed when they're IN their hides.
So in conclusion, get some small adult mice. Don't scent them. Feed at night while the snake is in her hide.
Oh, one other thing. Make sure the prey is hot enough. You can use your temp gun til you get the hang of it. Aim F r about 100° focusing on the head.
Since fuzzies are so small they cool down real quick too.