I have a six month old, female Guinea pig who is extremely social. She loves to be held and cuddled and never bites. Now, I want to introduce another female guinea pig, preferable a baby. My question is how much will this effect my current guinea pig, Ginny's, behavior? I'm worried she may become, a) antisocial, preferring to be with her new friend, or b) she'll openly attack the new guinea pig. What should I do?