Actually if you have exhausted all other options it is a good idea. Some, but not all do better in a smaller cage. Females may react to another male, but it’s usually the males that react to pheromones given off by the female. Maybe your girl is a boy and doesn’t like Gerald.
Hard to say at this point but if you don’t have anything else to try, try a smaller cage and see if it helps. Maybe it will maybe it won’t. And as far as food, there is no wild retic that eats constantly they just don’t. I think you are good on the feeding end.