Question???? I am terribly confused

Can anyone tell me is it possible for a female to lay slug eggs if she hasn't been exposed to a male? or they will not lay eggs.. slug or not without having been breed with??

yes it is possible

Is that something that will occur every year if she is not exposed to a male to lay slug eggs then? or are the eggs supposed to be reabsorbed into the body normally?

Normally follicles are reabsorbed.