I saw some discharge from her nose, so I kept an eye on her. Some time later I saw a bit of discharge from her eye, so Dad's getting ready to make an appointment for the vet. I'm holding her right now. She doesn't seem to be showing much symptoms now (apart from sometimes being a bit "puffed up", but that might just be because it's getting colder). We're going to take her to the vet before it becomes major. Don't worry, I've printed out the Guinea Lynx list of medications that are harmful to guinea pigs.