I always feed my BP in the same cage, but after a few weeks of getting a hiss when opening the cage, I decide to feed in a separate tank. I didn't wanted her to asimilate the actions one with the other. I put the rat in the tank and soon after I introduced the snake. She didn't eat it. She even "stood" back a couple of times. After that I put the snake in her cage and introduced the rat, but she did the same thing. It's very strange, she's been eating every week and a half for almost a year and a half now.

I don't know if this is a factor too, but I recently bought a personal fan to keep the cooler area of the cage below the 87-88 degrees, that is the normal temperature here. I am using a timer and every half hour it turns on/off.

Could the fan have stressed out the snake? Or should I consider never changing her from the cage to the tank for feeding?