Headscratchers / Laura Caxton

Deanna's vampiric toughness seems kind of inconsistent. She's strong enough that bullets bounce right off her skin, but she cuts herself up real bad by running into some shards of glass? Also, given the kind of strength vampires display, shouldn't she have just been able to just jump right out of that swimming pool?

Ok, Laura is willing to lie about Arkeley using entrapment on Justinia...but executing her anyways is out of the question?