Other than getting clarification on what they mean by brumating, I wouldn't be overly concerned about anything. I've had virgins lay slugs in just about every species of reptile I've had a female of. BPs are one of those, and they have gone on to lay healthy eggs when bred. If you are not trying to breed, she may do it again though, so you should be mindful of that and make sure she has good husbandry to reduce the chance of egg binding.