I had guinea pigs as a child, and when my boys were small kept them again. I still miss having them, but with 2 cats and 2 dogs....not the best housemates. Lots of good advice from everyone. Just give her lots of love and attention as they do usually live in groups...also, lettuce is not very good for the majority of small domestic animals, it can upset their digestive system. We used to have an outside run (escape proof and protected from predators), they loved grazing on the lawn (also their droppings are excellent fertilizer for plants and really great for the compost bin). Oh, I forgot, I used to have a salt/mineral lick for mine as well as putting their water in a dripper bottle (it's easier for them to manage).