Hi there,
I doubt your female is gravid (meaning she has ovulated and is developing eggs) as eating well would not be consistant with that at all. Gravid snakes usually have no appetite and look like they feel "yucky".
However, she may be gearing up (developing follicles). Alot of girls eat really heavy right at the beginning of breeding time. Girls sometimes lay inverted or sideways when developing follicles too. Is she laying mostly on the warm or cold side of her home?
Another possibility (though not as exciting) is that she was laying inverted because of all the food she is eating. Balls will invert sometimes after big meals, both males and females.
I hope you are on your way to babies! Time will tell!
Christy