You should feel honoured
I once met a breeder who gave you a puppy if that puppy tinkled on you. She said that you will have the most amazing bond with that puppy and that puppy with you.
Well, I don't know if that is true, but what I do know is this: Puppies find it very difficult to tinkle in a strange place and will only tinkle when they are relaxed (This was certainly true when I took my 10 week old on a six hour car ride. We made frequent stops, but she held it... for six hours.).
Anyway, the point is that when a puppy is completely relaxed, their bladders let go.
I think you should see this as a blessing during the puppyhood. Let's face it, it will definitely be something that you will remember forever. They won't make this mistake as adults, when they have full control over their bladders.
So, try to see it as a blessing and feel honoured that she feels so relaxed with you (the same way she did when she was with her mama).