There are a lot of threads on intros if you do a search (it acts up and doesn't want to work sometimes, but it's working right now). What's the potential new girl's story? Like is she a lone rat, why are they getting rid of her, etc. You still should probably QT even if she's been solo for the length of time a QT lasts or longer, just because if you've never met this person, putting that level of trust in them that they haven't been anywhere that they could have picked something up and brought home to the rat is generally not recommended because you don't know them and you can't really trust someone you know nothing about. It's possible you wouldn't have to QT, but knowing the details would help. With a good, reputable, rescue it's different because they're trustworthy (if they're good and reputable, which NMRR is).
