WOW! 10 years in a 1 gallon!! thats insane! I mean I understand she didnt know better, and its been 10 years, but thats a long time to have a pet, and if I had a goldfish for 10 years and someone told me that, I would be running out to get a new tank that next day just because I would feel absolutely horrible about the way I kept him originally. (NOW, this is if I didnt think to do research on care originally)
I will say that my boyfriends goldfish lived in a 10 gallon most of its life, but they did upgrade in the last few years when they started to do research about them.