Sue is right...people are going to be upset with how you obtained your newest addition...but....there are also a lot of people here who have done the same thing. You'll see.
What do you know about PBs in general? What will you do if the new pup doesn't get along with Nala in a couple years? Do you think it's all in how they're raised? Would you be willing to crate and rotate?
I only ask because these are commonly the things that new owners have the most trouble with. If their dog doesn't like another, they think something is wrong with their dog-or that they did something wrong as an owner. That's not always the case. It can be, but it isn't always what's going on.
I look forward to having you hear on the forum. I hope you're able to arm your self with useful information that makes you the best owner you can be!