It is too early for her to go under general anaesthesia, wait untill she is three months old. It seems enlarged only because your puppy grows and the skin stretches. And, yes, if you plan to neuter her, you can wait untill much later. In fact, unless it is really severe, they can jump fences, give birth and live altother absolutely happily with it. But, because it doesn't have any fur protection - it is potentially exposed to any scratches by twigs, and subsequently to skin infections. Don't try applying any sticky patches or anything of the sort onto that spot. Just mark planned operation in your calendar and don't worry much.