Not at all unusual. We see this same question come up all the time in this circumstance. It's mostly stress and getting used to being someplace new. Sooner or later, she will go.
Keep taking her out and giving the opportunity so she gets used to the idea of going out. If you are taking her out on a leash and not in a fenced area, then try to give her a little privacy if you can like letting her go behind something as she may not be used to going while on a leash. Some people have had success by tying 2 leashes together to give them a longer lead to get away from the human, but this is also risky with a new dog. If you do that, be sure that the leashes cannot come apart, and as always, keep the "death grip" on the leash and give it a couple of wraps around your hand and wrist so the dog can't bolt it something startles her.
Congratulations on your new girl. She will be fine.