[Aegis]

If you recently adopted her, then it is normal for her to act skittish. As for the biting, I recommend giving her chew toys, especially ones made of wood. This should (hopefully!) encourage her to chew on inanimate objects instead of biting people. Eventually when she gets used to your scent she might be calmer around you. And also, hamsters stop growing at around six months so her posture might be something else.