It could be in a week or 2 months. It's impossible to know. They ovulate when they are ready. Ive heard of females storing sperm for over a year. She didn't have to be housed with a male, she doesn't even need to come in any contact with one. She can still lay eggs, but depending in whether she stored sperm or not depends on whether she lays fertile or not. If she didn't and lays they will just be slugs or infertile.