Wow I am amazed you have had that animal for that long congrats! I wouldn't seperate her to feed her. I think its best to feed them in their regular enclosure. Do you keep the live mouse/mice in the same room for a long period of time before feeding? I know that moving the live prey to another room might help. Think about this when you first smell a new food that is in the room it smells great but when you have it in the room for a long period of time the smell goes away. I keep my rodents in the basement far away from my room upstairs. This way I can take the rodent to the room only when they are to be fed so the new smell is new. Does that make sense?