She is in a new environment and this behavior is totally normal. If yawning and exploring is the only symptoms it is definitely nothing to worry about. Ball Pythons yawn... some do it to show off what weaponry they carry, to readjust their jaws, or simply just to yawn. I wouldn't be jumping to the wrong conclusions right away or this snake keeping thing is going to be a lot more stressful for you when it totally does not have to be. Just leave her alone. Stay out of her sights as she gets used to her new environment. Not all ball pythons are shy.