It's hard to tell how big she is from the pics. Dragons under 8'' should not really be handled more than is absolutely needed. That is probably why she didn't come hand-tamed from the breeder. They are very skittish at that size since they are prey for nearly everything, including larger bearded dragons.

Regardless, it is unusual for bearded dragons to be that aggressive (above pic) on a regular basis. I would double check all of your husbandry (temps, food, etc) and make sure she has a good hide spot to calm down and destress in. Hide spots are normally not a good idea for young dragons since it also provides a hide spot for feeder insects but it looks like yours really needs one.

As mentioned above, the best way to hand tame is to hand feed. Give your a couple weeks to completely settle before trying though. Hand-feeding really works! All of my adult and juvies rush to and line up at their glass doors to be fed dubias when they see me coming!