Some info about your temps and enclosure might help us think of some more suggestions.

Sometimes adjusting the enclosure size, adding or removing hides, changing substrates, or adding some 'cover' can help. There are many small adjustments you can try, but they need to be spread out over a few weeks so they don't get more stressed from the changes.

I agree trying live would be a good idea. What is her behavior like when you offer food? If she is shy, I think the rat pup might be a better option so it doesn't spook the snake.

Good luck!