Do you know how old she is? In what ways have you tried to introduce her to a cagemate?
There are ways to successfully introduce even adult rats, but it can take time and patience (depending on the rats involved), and it's a specific process. Since rats are territorial animals, you need to start on completely neutral territory. If you just throw two rats together in one rat's territory, it's asking for a fight to break out. Sometimes older rats will accept younger rats better than other adults, but you have to be careful doing this because an adult rat can also severely injure or kill a youngster. If you can find one or don't mind spending the money, a neutered male can make a great companion too, since most rats will accept the opposite sex (even if that opposite is altered). If all else fails though... she might just have to be one of those rats that lives alone.
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