not to get off subject but will she not take rats? 1 rat is alot better and cheaper than 5 mice. I know of some that are simply mouse eaters but have you tried to swich her?
As far as breeding I have around 30 balls and do breed mice and rats however I can not keep up with the demand of my snakes with the rodent operation that I have so I still end up buying around 10-20 rats a week but I have a local pet store who I sell my lesser quality balls and all my normals through who gives me fair sized rats at around $2 bucks each so I am better off than most when I have to buy them