While I normally agree to each their own and different things work for different people, what's the point in this? Why does it matter or do you need to know how many eggs/slugs there will be? Once the female ovulates, it's done. It just seems like unnecessary stress. Sorry if this is going off topic.
OP - it might be nothing, might be she built but won't ovulate or maybe she will.
Females of a variety of species can and do lay full clutches of non-fertalized eggs and there is no harm. I think surgery to remove follicles seems totally unneeded and would be a waste of money not to mention the stress it would put on the female. My female corn lays a clutch of eggs each year now that there's a male corn in the house, but they have never been in contact. I would only think surgery would be necessary if the female becomes egg bound while trying to lay.
Hope everything works out okay!