Welcome! As a child, I had a solo guinea pig (their social needs were not really common knowledge back then and most probably lived alone.) Although I think she had as good a life as we could possibly give her, at this point I can say that I think pairs are better for the pigs themselves, seeing how much happier my pairs have been than my pig who lived alone. There is a real noticeable difference in how social, alert, confident, and curious my pairs have been versus my solo pig as a child, and also my paired pigs when they were between partners due to bereavement. My experience is that my paired pigs interact with each other, with me, and with the environment more, are a lot less skittish, and their personalities come out so much more when they have both human interaction and another guinea pig to interact with. They clearly are social animals who have a relationship with one another, and some of my best guinea pig memories have to do with seeing the bond between my pigs. A lot of owners fear that if there is more than one pig, they will not bond to their owners in the same way, but that hasn't been my experience. My paired pigs have actually interacted with me a lot more than I remember my solo pig doing and have been a lot more confident and less skittish because, for a guinea pig, there is safety in numbers and they become a lot bolder. And although they have each other as company, all my pigs have still enjoyed lap time and have a bond with me too. I would say if it's at all possible, introducing a friend would probably be a great idea, both for your piggie who will get to enjoy the company of her own species, and for you because you will get to see a whole bunch more natural guinea pig behavior. And plus, two piggies is twice the cute, right? LOL!