That's a bit contradicting. If you're used to killing for example, clearly you have no strong compulsion against it. Saying that it has nothing to do with what you're used to, is a bit of an overstatement. Overall, I for example, would have no strong compulsion against selling out a friend if I knew he'd try to kill me if he saw me again - which is the case here, with the vampire hunter having been embraced. That's just me, but I agree with Smiling Jack in that self-preservation is one of the most vital parts of humanity. Considering how recently she was embraced, seems to me she should have no problem with taking care of this threat to her own life.
Well, unless her personality is all that complex and she's able to put others' safety over her own even if they mean her death. Which you would know best, since you created her.